6,000 lookalike pairs, side by side
Accentors
- Alpine Accentor vs Dunnock
- Dunnock vs Siberian Accentor
- Alpine Accentor vs Siberian Accentor
- Alpine Accentor vs Robin Accentor
- Robin Accentor vs Siberian Accentor
- Brown Accentor vs Siberian Accentor
- Brown Accentor vs Robin Accentor
- Black-throated Accentor vs Siberian Accentor
- Black-throated Accentor vs Robin Accentor
- Black-throated Accentor vs Brown Accentor
African and New World Parrots
- Red-lored Amazon vs White-fronted Amazon
- Orange-chinned Parakeet vs Yellow-chevroned Parakeet
- Blue-headed Parrot vs White-crowned Parrot
- Brown-throated Parakeet vs Olive-throated Parakeet
- Mealy Amazon vs Red-lored Amazon
- Mealy Amazon vs White-fronted Amazon
- Finsch's Parakeet vs White-eyed Parakeet
- Chestnut-fronted Macaw vs Scarlet Macaw
- Orange-chinned Parakeet vs Plain Parakeet
- Plain Parakeet vs Yellow-chevroned Parakeet
- Blue-and-yellow Macaw vs Scarlet Macaw
- Blue-and-yellow Macaw vs Chestnut-fronted Macaw
- Olive-throated Parakeet vs Orange-fronted Parakeet
- Brown-throated Parakeet vs Orange-fronted Parakeet
- Orange-winged Amazon vs Red-lored Amazon
- Orange-winged Amazon vs White-fronted Amazon
- Mealy Amazon vs Orange-winged Amazon
- Mealy Amazon vs Yellow-crowned Amazon
- Orange-winged Amazon vs Yellow-crowned Amazon
- Blue-headed Parrot vs Scaly-headed Parrot
- Scaly-headed Parrot vs White-crowned Parrot
- Orange-winged Amazon vs Red-crowned Amazon
- Red-crowned Amazon vs Yellow-crowned Amazon
- Orange-winged Amazon vs Turquoise-fronted Amazon
- Turquoise-fronted Amazon vs Yellow-crowned Amazon
- Red-crowned Amazon vs Turquoise-fronted Amazon
- Blue-headed Parrot vs Bronze-winged Parrot
- Bronze-winged Parrot vs White-crowned Parrot
- Bronze-winged Parrot vs Scaly-headed Parrot
- Red-masked Parakeet vs White-eyed Parakeet
- Finsch's Parakeet vs Red-masked Parakeet
- Cobalt-winged Parakeet vs Orange-chinned Parakeet
- Cobalt-winged Parakeet vs Yellow-chevroned Parakeet
- Cobalt-winged Parakeet vs Plain Parakeet
- Olive-throated Parakeet vs Peach-fronted Parakeet
- Brown-throated Parakeet vs Peach-fronted Parakeet
- Orange-fronted Parakeet vs Peach-fronted Parakeet
- Mitred Parakeet vs White-eyed Parakeet
- Finsch's Parakeet vs Mitred Parakeet
- Mitred Parakeet vs Red-masked Parakeet
- Blue-crowned Parakeet vs Mitred Parakeet
- Blue-crowned Parakeet vs Peach-fronted Parakeet
- Blue-crowned Parakeet vs Red-bellied Macaw
- Green-rumped Parrotlet vs Spectacled Parrotlet
- Green-rumped Parrotlet vs Red-bellied Macaw
- Red-and-green Macaw vs Scarlet Macaw
- Chestnut-fronted Macaw vs Red-and-green Macaw
- Blue-and-yellow Macaw vs Red-and-green Macaw
- Red-and-green Macaw vs Red-bellied Macaw
- White-winged Parakeet vs Yellow-chevroned Parakeet
- Plain Parakeet vs White-winged Parakeet
- Cobalt-winged Parakeet vs White-winged Parakeet
- Red-shouldered Macaw vs White-winged Parakeet
- Red-billed Parrot vs Scaly-headed Parrot
- Bronze-winged Parrot vs Red-billed Parrot
- Pacific Parrotlet vs Spectacled Parrotlet
- Green-rumped Parrotlet vs Pacific Parrotlet
- Burrowing Parrot vs Scaly-naped Amazon
- Austral Parakeet vs Burrowing Parrot
- Brown-headed Parrot vs Burrowing Parrot
- Pacific Parakeet vs Red-masked Parakeet
- Mitred Parakeet vs Pacific Parakeet
- Maroon-bellied Parakeet vs Maroon-tailed Parakeet
- Maroon-bellied Parakeet vs Sulphur-winged Parakeet
- Maroon-tailed Parakeet vs Sulphur-winged Parakeet
- Military Macaw vs Red-and-green Macaw
- Brown-headed Parrot vs Senegal Parrot
- Bronze-winged Parrot vs Speckle-faced Parrot
- Red-billed Parrot vs Speckle-faced Parrot
- Austral Parakeet vs Slender-billed Parakeet
- Cobalt-winged Parakeet vs Golden-winged Parakeet
- Golden-winged Parakeet vs White-winged Parakeet
- Cuban Amazon vs Scaly-naped Amazon
- Golden-capped Parakeet vs Nanday Parakeet
- Golden-capped Parakeet vs Pileated Parrot
- Caatinga Parakeet vs Peach-fronted Parakeet
- Caatinga Parakeet vs Pileated Parrot
- Caatinga Parakeet vs Orange-fronted Parakeet
- Brown-throated Parakeet vs Caatinga Parakeet
- Lilac-crowned Amazon vs Scaly-naped Amazon
- Cuban Amazon vs Lilac-crowned Amazon
- Lilac-crowned Amazon vs Pileated Parrot
- Golden-plumed Parakeet vs Lilac-crowned Amazon
- Caatinga Parakeet vs Golden-plumed Parakeet
- Golden-capped Parakeet vs Golden-plumed Parakeet
- Brown-hooded Parrot vs Rose-faced Parrot
- Cobalt-winged Parakeet vs Tui Parakeet
- Tui Parakeet vs White-winged Parakeet
- Golden-winged Parakeet vs Tui Parakeet
- Brown-hooded Parrot vs Orange-cheeked Parrot
- Orange-cheeked Parrot vs Rose-faced Parrot
- Scaly-naped Amazon vs Yellow-headed Amazon
- Cuban Amazon vs Yellow-headed Amazon
- Lilac-crowned Amazon vs Yellow-headed Amazon
- Blue-winged Macaw vs Golden-collared Macaw
- Green-cheeked Parakeet vs Maroon-bellied Parakeet
- Green-cheeked Parakeet vs Maroon-tailed Parakeet
- Green-cheeked Parakeet vs Sulphur-winged Parakeet
- Maroon-tailed Parakeet vs Painted Parakeet
- Painted Parakeet vs Sulphur-winged Parakeet
- Green-cheeked Parakeet vs Painted Parakeet
- Cuban Amazon vs Festive Amazon
- Festive Amazon vs Lilac-crowned Amazon
- Festive Amazon vs Yellow-headed Amazon
- Festive Amazon vs Short-tailed Parrot
- Black-headed Parrot vs White-bellied Parrot
- Short-tailed Parrot vs White-bellied Parrot
- Grey-hooded Parakeet vs Short-tailed Parrot
- Grey-hooded Parakeet vs Red-fan Parrot
- Red-fan Parrot vs White-bellied Parrot
- Brown-headed Parrot vs Cape Parrot
- Cape Parrot vs Senegal Parrot
- Cape Parrot vs Red-fan Parrot
- Cape Parrot vs Yellow-eared Parrot
- Red-fan Parrot vs Yellow-eared Parrot
- Grey-hooded Parakeet vs Yellow-eared Parrot
- Red-bellied Parrot vs Senegal Parrot
- Cape Parrot vs Red-bellied Parrot
- Hispaniolan Parakeet vs Red-masked Parakeet
- Hispaniolan Parakeet vs Mitred Parakeet
- Hispaniolan Parakeet vs Pacific Parakeet
- Green-cheeked Parakeet vs Santarem Parakeet
- Painted Parakeet vs Santarem Parakeet
- Dusky Parrot vs Red-billed Parrot
- Dusky Parrot vs Speckle-faced Parrot
- Bronze-winged Parrot vs Dusky Parrot
- Festive Amazon vs Yellow-shouldered Amazon
- Blue-headed Macaw vs Blue-winged Macaw
- Blue-headed Macaw vs Golden-collared Macaw
- Grey-hooded Parakeet vs Mountain Parakeet
- Golden-winged Parakeet vs Grey-cheeked Parakeet
- Grey-cheeked Parakeet vs Tui Parakeet
- Grey-cheeked Parakeet vs White-winged Parakeet
- Grey-cheeked Parakeet vs Yellow-faced Parrot
- Mountain Parakeet vs Yellow-faced Parrot
- Vinaceous-breasted Amazon vs Yellow-shouldered Amazon
- Hispaniolan Amazon vs Yellow-shouldered Amazon
- Hispaniolan Amazon vs Vinaceous-breasted Amazon
African Barbets
- Southern Red-fronted Tinkerbird vs Yellow-fronted Tinkerbird
- Black-collared Barbet vs Vieillot's Barbet
- Crested Barbet vs Red-and-yellow Barbet
- Black-collared Barbet vs White-headed Barbet
- Vieillot's Barbet vs White-headed Barbet
- Acacia Pied Barbet vs Hairy-breasted Barbet
- Red-rumped Tinkerbird vs Southern Red-fronted Tinkerbird
- Black-billed Barbet vs Black-collared Barbet
- Black-billed Barbet vs Vieillot's Barbet
- Black-billed Barbet vs White-headed Barbet
Albatrosses
- Black-browed Albatross vs Shy Albatross
- Black-footed Albatross vs Laysan Albatross
- Black-browed Albatross vs Grey-headed Albatross
- Grey-headed Albatross vs Shy Albatross
- Black-browed Albatross vs Salvin's Albatross
- Salvin's Albatross vs Shy Albatross
- Grey-headed Albatross vs Salvin's Albatross
- Buller's Albatross vs Shy Albatross
- Buller's Albatross vs Grey-headed Albatross
- Buller's Albatross vs Salvin's Albatross
- Snowy Albatross vs Southern Royal Albatross
- Northern Royal Albatross vs Snowy Albatross
- Northern Royal Albatross vs Southern Royal Albatross
- Antipodean Albatross vs Snowy Albatross
- Antipodean Albatross vs Southern Royal Albatross
- Antipodean Albatross vs Northern Royal Albatross
- Grey-headed Albatross vs Indian Yellow-nosed Albatross
- Indian Yellow-nosed Albatross vs Salvin's Albatross
- Buller's Albatross vs Indian Yellow-nosed Albatross
- Light-mantled Albatross vs Sooty Albatross
- Black-footed Albatross vs Waved Albatross
- Laysan Albatross vs Waved Albatross
Anhinga and Darters
Antbirds, Antshrikes, Antwrens, and Antvireos
- Chestnut-backed Antbird vs Great Antshrike
- Barred Antshrike vs Variable Antshrike
- Great Antshrike vs Variable Antshrike
- Chestnut-backed Antbird vs Variable Antshrike
- Great Antshrike vs Plain Antvireo
- Chestnut-backed Antbird vs Plain Antvireo
- Barred Antshrike vs Black-crowned Antshrike
- Black-crowned Antshrike vs Chestnut-backed Antbird
- Black-crowned Antshrike vs Variable Antshrike
- Bar-crested Antshrike vs Barred Antshrike
- Bar-crested Antshrike vs Variable Antshrike
- Bar-crested Antshrike vs Black-crowned Antshrike
- Bar-crested Antshrike vs Dot-winged Antwren
- Dot-winged Antwren vs Fasciated Antshrike
- Black-hooded Antshrike vs Variable Antshrike
- Black-crowned Antshrike vs Black-hooded Antshrike
- Bar-crested Antshrike vs Black-hooded Antshrike
- Checker-throated Stipplethroat vs White-bellied Antbird
- Spot-backed Antshrike vs White-bellied Antbird
- Checker-throated Stipplethroat vs Spot-backed Antshrike
- Spot-backed Antshrike vs Zeledon's Antbird
- Black-hooded Antshrike vs Rufous-capped Antshrike
- Black-hooded Antshrike vs Plain-winged Antshrike
- Plain-winged Antshrike vs Rufous-capped Antshrike
- Pygmy Antwren vs Slaty Antwren
- Black-capped Antwren vs Rufous-margined Antwren
- Ferruginous Antbird vs Streak-headed Antbird
- Pacific Antwren vs Slaty Antwren
- Pacific Antwren vs Pygmy Antwren
- Grey Antbird vs Jet Antbird
- Black-hooded Antshrike vs Mouse-colored Antshrike
- Mouse-colored Antshrike vs Rufous-capped Antshrike
- Mouse-colored Antshrike vs Plain-winged Antshrike
- Black-throated Antbird vs Peruvian Warbling Antbird
- Black-throated Antbird vs Mouse-colored Antshrike
- Black-throated Antbird vs Jet Antbird
- Chestnut-backed Antshrike vs Rufous-capped Antshrike
- Chestnut-backed Antshrike vs Plain-winged Antshrike
- Chestnut-backed Antshrike vs Mouse-colored Antshrike
- East Amazonian Fire-eye vs White-shouldered Fire-eye
- Grey Antwren vs Pygmy Antwren
- Grey Antwren vs Pacific Antwren
- Cinereous Antshrike vs Dusky-throated Antshrike
- Mouse-colored Antshrike vs Uniform Antshrike
- Chestnut-backed Antshrike vs Uniform Antshrike
- Mouse-colored Antshrike vs Planalto Slaty Antshrike
- Chestnut-backed Antshrike vs Planalto Slaty Antshrike
- Planalto Slaty Antshrike vs Uniform Antshrike
- Plain Antvireo vs Spot-breasted Antvireo
- Collared Antshrike vs Uniform Antshrike
- Collared Antshrike vs Planalto Slaty Antshrike
- Collared Antshrike vs Star-throated Antwren
- Silvered Antbird vs Star-throated Antwren
- Dull-mantled Antbird vs Star-throated Antwren
- Dull-mantled Antbird vs Silvered Antbird
- Giant Antshrike vs Silvered Antbird
- Dull-mantled Antbird vs Giant Antshrike
- Giant Antshrike vs Star-throated Antwren
- Lined Antshrike vs Uniform Antshrike
- Lined Antshrike vs Planalto Slaty Antshrike
- Collared Antshrike vs Lined Antshrike
- Amazonian Antshrike vs Collared Antshrike
- Amazonian Antshrike vs Lined Antshrike
- Amazonian Antshrike vs Planalto Slaty Antshrike
- Amazonian Antshrike vs Ocellated Antbird
- Lined Antshrike vs Ocellated Antbird
- Dusky Antbird vs Parker's Antbird
- Ferruginous Antbird vs Scaled Antbird
- Scaled Antbird vs Streak-headed Antbird
- Scaled Antbird vs Stripe-backed Antbird
- Plain Antvireo vs Spot-crowned Antvireo
- Spot-breasted Antvireo vs Spot-crowned Antvireo
- Spot-crowned Antvireo vs Stripe-backed Antbird
- Plumbeous Antbird vs Stripe-backed Antbird
- Long-winged Antwren vs Pygmy Antwren
- Long-winged Antwren vs Pacific Antwren
- Grey Antwren vs Long-winged Antwren
- Large-billed Antwren vs Rufous-margined Antwren
- Black-capped Antwren vs Large-billed Antwren
- Amazonian Streaked Antwren vs Grey Antwren
- Amazonian Streaked Antwren vs Long-winged Antwren
- Long-winged Antwren vs Moustached Antwren
- Amazonian Streaked Antwren vs Moustached Antwren
- Dusky-tailed Antbird vs Ferruginous Antbird
- Dusky-tailed Antbird vs Streak-headed Antbird
- Dusky-tailed Antbird vs Scaled Antbird
- Rusty-backed Antwren vs Southern White-fringed Antwren
- Spot-backed Antbird vs Spotted Antbird
- Plumbeous Antbird vs Spot-winged Antbird
- Dull-mantled Antbird vs Esmeraldas Antbird
- Plain Antvireo vs Streak-crowned Antvireo
- Spot-breasted Antvireo vs Streak-crowned Antvireo
- Spot-crowned Antvireo vs Streak-crowned Antvireo
- Bare-crowned Antbird vs Streak-crowned Antvireo
- Bare-crowned Antbird vs Northern Slaty Antshrike
- Northern Slaty Antshrike vs Sooretama Slaty Antshrike
- Bluish-slate Antshrike vs Cinereous Antshrike
- Bluish-slate Antshrike vs Dusky-throated Antshrike
- Ochre-rumped Antbird vs Scaled Antbird
- Dusky-tailed Antbird vs Ochre-rumped Antbird
- Long-winged Antwren vs Unicolored Antwren
- Amazonian Streaked Antwren vs Unicolored Antwren
- Moustached Antwren vs Unicolored Antwren
- Black Antshrike vs Northern Slaty Antshrike
- Black Antshrike vs Sooretama Slaty Antshrike
- Bertoni's Antbird vs Scaled Antbird
- Bertoni's Antbird vs Dusky-tailed Antbird
- Bertoni's Antbird vs Ochre-rumped Antbird
- Northern Slaty Antshrike vs White-shouldered Antshrike
- Sooretama Slaty Antshrike vs White-shouldered Antshrike
- Black Antshrike vs White-shouldered Antshrike
- Black-bellied Antwren vs Southern White-fringed Antwren
- Black-bellied Antwren vs Rusty-backed Antwren
- Black Antbird vs Dusky Antbird
- Black Antbird vs Parker's Antbird
- Black Antbird vs Silvery-cheeked Antshrike
- Goeldi's Antbird vs White-shouldered Antbird
- Goeldi's Antbird vs Silvery-cheeked Antshrike
- Band-tailed Antbird vs Black-chinned Antbird
- Black-chinned Antbird vs Silvery-cheeked Antshrike
- Guianan Warbling Antbird vs Peruvian Warbling Antbird
- Peruvian Warbling Antbird vs Yellow-breasted Warbling Antbird
- Guianan Warbling Antbird vs Yellow-breasted Warbling Antbird
- Dot-backed Antbird vs Spotted Antbird
- Dot-backed Antbird vs Spot-backed Antbird
- Sooty Antbird vs Zeledon's Antbird
- Blue-lored Antbird vs Zeledon's Antbird
- Blue-lored Antbird vs Sooty Antbird
- Black-faced Antbird vs White-lined Antbird
- Rufous-winged Antshrike vs White-shouldered Antshrike
- Black Antshrike vs Rufous-winged Antshrike
- Stripe-chested Antwren vs Unicolored Antwren
- Black-crested Antshrike vs Glossy Antshrike
- Checker-throated Stipplethroat vs Ornate Stipplethroat
- Black-backed Antshrike vs Rufous-winged Antshrike
- Ferruginous-backed Antbird vs Squamate Antbird
Antpittas
- Chestnut-crowned Antpitta vs Tawny Antpitta
- Chestnut-crowned Antpitta vs Scaled Antpitta
- Scaled Antpitta vs Tawny Antpitta
- Chestnut-crowned Antpitta vs Equatorial Antpitta
- Equatorial Antpitta vs Tawny Antpitta
- Equatorial Antpitta vs Scaled Antpitta
- Chestnut-naped Antpitta vs Tawny Antpitta
- Chestnut-naped Antpitta vs Scaled Antpitta
- Chestnut-naped Antpitta vs Equatorial Antpitta
- Scaled Antpitta vs Yellow-breasted Antpitta
- Equatorial Antpitta vs Yellow-breasted Antpitta
- Chestnut-naped Antpitta vs Yellow-breasted Antpitta
- Thicket Antpitta vs Thrush-like Antpitta
- Variegated Antpitta vs Yellow-breasted Antpitta
- Ochre-breasted Antpitta vs Slaty-crowned Antpitta
- Variegated Antpitta vs White-bellied Antpitta
- Undulated Antpitta vs Variegated Antpitta
- Undulated Antpitta vs White-bellied Antpitta
- Muisca Antpitta vs White-bellied Antpitta
- Muisca Antpitta vs Undulated Antpitta
- Bicolored Antpitta vs Undulated Antpitta
- Bicolored Antpitta vs Muisca Antpitta
- Plain-backed Antpitta vs Undulated Antpitta
- Muisca Antpitta vs Plain-backed Antpitta
- Bicolored Antpitta vs Plain-backed Antpitta
- Bicolored Antpitta vs Brown-banded Antpitta
- Brown-banded Antpitta vs Plain-backed Antpitta
- Moustached Antpitta vs Plain-backed Antpitta
- Brown-banded Antpitta vs Moustached Antpitta
- Bicolored Antpitta vs Moustached Antpitta
- Santa Marta Antpitta vs Stripe-headed Antpitta
- Giant Antpitta vs Santa Marta Antpitta
- Giant Antpitta vs Stripe-headed Antpitta
Antthrushes
Asian Barbets
- Coppersmith Barbet vs White-cheeked Barbet
- Coppersmith Barbet vs Taiwan Barbet
- Taiwan Barbet vs White-cheeked Barbet
- Brown-headed Barbet vs Coppersmith Barbet
- Brown-headed Barbet vs White-cheeked Barbet
- Brown-headed Barbet vs Taiwan Barbet
- Blue-throated Barbet vs Taiwan Barbet
- Blue-throated Barbet vs Brown-headed Barbet
- Blue-throated Barbet vs Great Barbet
- Blue-throated Barbet vs Malabar Barbet
- Great Barbet vs Malabar Barbet
- Golden-throated Barbet vs Malabar Barbet
- Crimson-fronted Barbet vs Malabar Barbet
- Crimson-fronted Barbet vs Golden-throated Barbet
- Golden-throated Barbet vs Golden-whiskered Barbet
- Crimson-fronted Barbet vs Golden-whiskered Barbet
- Golden-throated Barbet vs Red-throated Barbet
- Crimson-fronted Barbet vs Red-throated Barbet
- Golden-whiskered Barbet vs Red-throated Barbet
- Red-throated Barbet vs Yellow-fronted Barbet
- Golden-whiskered Barbet vs Yellow-fronted Barbet
- Fire-tufted Barbet vs Red-crowned Barbet
- Black-browed Barbet vs Red-crowned Barbet
- Black-browed Barbet vs Fire-tufted Barbet
- Black-browed Barbet vs Golden-naped Barbet
Auks, Puffins, and Murres
- Black Guillemot vs Razorbill
- Black Guillemot vs Pigeon Guillemot
- Pigeon Guillemot vs Razorbill
- Atlantic Puffin vs Tufted Puffin
- Little Auk vs Tufted Puffin
- Common Murre vs Thick-billed Murre
- Little Auk vs Thick-billed Murre
- Atlantic Puffin vs Horned Puffin
- Horned Puffin vs Tufted Puffin
- Crested Auklet vs Parakeet Auklet
Australasian Babblers
Australasian Robins
- Red-capped Robin vs Scarlet Robin
- Scarlet Robin vs Tomtit
- Red-capped Robin vs Tomtit
- Flame Robin vs Scarlet Robin
- Flame Robin vs Red-capped Robin
- Flame Robin vs Tomtit
- Rose Robin vs Tomtit
- Flame Robin vs Rose Robin
- Rose Robin vs South Island Robin
- Flame Robin vs South Island Robin
- South Island Robin vs Tomtit
- Eastern Yellow Robin vs White-breasted Robin
- Dusky Robin vs Hooded Robin
- Eastern Yellow Robin vs Western Yellow Robin
- Western Yellow Robin vs White-breasted Robin
- Norfolk Robin vs Pink Robin
Australasian Treecreepers
- Brown Treecreeper vs Red-browed Treecreeper
- Brown Treecreeper vs Rufous Treecreeper
- Red-browed Treecreeper vs Rufous Treecreeper
- Brown Treecreeper vs White-browed Treecreeper
- Red-browed Treecreeper vs White-browed Treecreeper
- Rufous Treecreeper vs White-browed Treecreeper
- Black-tailed Treecreeper vs Red-browed Treecreeper
- Black-tailed Treecreeper vs Rufous Treecreeper
- Black-tailed Treecreeper vs White-browed Treecreeper
Bay Owls and Barn Owls
Bee-eaters
- Asian Green Bee-eater vs European Bee-eater
- Asian Green Bee-eater vs Blue-tailed Bee-eater
- Blue-tailed Bee-eater vs European Bee-eater
- Asian Green Bee-eater vs Rainbow Bee-eater
- European Bee-eater vs Rainbow Bee-eater
- Blue-tailed Bee-eater vs Rainbow Bee-eater
- Blue-tailed Bee-eater vs Little Bee-eater
- Little Bee-eater vs Rainbow Bee-eater
- Blue-tailed Bee-eater vs Chestnut-headed Bee-eater
- Chestnut-headed Bee-eater vs Rainbow Bee-eater
- Chestnut-headed Bee-eater vs Little Bee-eater
- Little Bee-eater vs White-fronted Bee-eater
- Chestnut-headed Bee-eater vs White-fronted Bee-eater
- Blue-cheeked Bee-eater vs Little Bee-eater
- Blue-cheeked Bee-eater vs Chestnut-headed Bee-eater
- Blue-cheeked Bee-eater vs White-fronted Bee-eater
- Arabian Green Bee-eater vs White-fronted Bee-eater
- Arabian Green Bee-eater vs Blue-cheeked Bee-eater
- Blue-cheeked Bee-eater vs Blue-throated Bee-eater
- Arabian Green Bee-eater vs Blue-throated Bee-eater
- Arabian Green Bee-eater vs Swallow-tailed Bee-eater
- Blue-throated Bee-eater vs Swallow-tailed Bee-eater
- Blue-throated Bee-eater vs White-throated Bee-eater
- Swallow-tailed Bee-eater vs White-throated Bee-eater
- Southern Carmine Bee-eater vs Swallow-tailed Bee-eater
- Southern Carmine Bee-eater vs White-throated Bee-eater
- Cinnamon-chested Bee-eater vs White-throated Bee-eater
- Cinnamon-chested Bee-eater vs Southern Carmine Bee-eater
- Olive Bee-eater vs Southern Carmine Bee-eater
- Cinnamon-chested Bee-eater vs Olive Bee-eater
- Olive Bee-eater vs Red-throated Bee-eater
- Blue-bearded Bee-eater vs Red-bearded Bee-eater
- Northern Carmine Bee-eater vs Red-throated Bee-eater
- Black Bee-eater vs Red-throated Bee-eater
- Black Bee-eater vs Northern Carmine Bee-eater
- African Green Bee-eater vs Red-throated Bee-eater
- African Green Bee-eater vs Northern Carmine Bee-eater
- African Green Bee-eater vs Black Bee-eater
Birds-of-paradise
Boobies and Gannets
- Brown Booby vs Peruvian Booby
- Cape Gannet vs Northern Gannet
- Australasian Gannet vs Northern Gannet
- Australasian Gannet vs Cape Gannet
- Blue-footed Booby vs Peruvian Booby
- Blue-footed Booby vs Brown Booby
- Peruvian Booby vs Red-footed Booby
- Brown Booby vs Red-footed Booby
- Blue-footed Booby vs Red-footed Booby
- Brown Booby vs Masked Booby
- Blue-footed Booby vs Masked Booby
- Masked Booby vs Red-footed Booby
- Blue-footed Booby vs Nazca Booby
- Nazca Booby vs Red-footed Booby
- Masked Booby vs Nazca Booby
Bowerbirds
Bulbuls
- Red-vented Bulbul vs Red-whiskered Bulbul
- Light-vented Bulbul vs Red-vented Bulbul
- Light-vented Bulbul vs Red-whiskered Bulbul
- Black Bulbul vs Brown-eared Bulbul
- Common Bulbul vs Red-vented Bulbul
- Common Bulbul vs Red-whiskered Bulbul
- Common Bulbul vs Light-vented Bulbul
- Light-vented Bulbul vs White-browed Bulbul
- Common Bulbul vs White-browed Bulbul
- Sombre Greenbul vs White-browed Bulbul
- African Red-eyed Bulbul vs Cape Bulbul
- Cape Bulbul vs Himalayan Bulbul
- African Red-eyed Bulbul vs Himalayan Bulbul
- Himalayan Bulbul vs Yellow-browed Bulbul
- Black-crested Bulbul vs Yellow-browed Bulbul
- Himalayan Bulbul vs Styan's Bulbul
- Sooty-headed Bulbul vs Styan's Bulbul
- Sooty-headed Bulbul vs Stripe-throated Bulbul
- Brown-eared Bulbul vs Square-tailed Bulbul
- Black Bulbul vs Square-tailed Bulbul
- Black-crested Bulbul vs Flame-throated Bulbul
- Black-capped Bulbul vs Black-crested Bulbul
- Black-capped Bulbul vs Flame-throated Bulbul
Bushshrikes and Allies
Bustards
- Little Bustard vs Northern Black Korhaan
- Little Bustard vs Red-crested Korhaan
- Great Bustard vs Little Bustard
- Great Bustard vs Red-crested Korhaan
- Great Bustard vs Northern Black Korhaan
- Great Bustard vs Kori Bustard
- Australian Bustard vs Kori Bustard
- Blue Korhaan vs White-bellied Bustard
- Denham's Bustard vs Ludwig's Bustard
- Northern Black Korhaan vs Southern Black Korhaan
- Buff-crested Bustard vs Red-crested Korhaan
Buttonquail
Cardinals and Allies
- Scarlet Tanager vs Summer Tanager
- Black-headed Grosbeak vs Rose-breasted Grosbeak
- Summer Tanager vs Western Tanager
- Scarlet Tanager vs Western Tanager
- Blue Grosbeak vs Indigo Bunting
- Indigo Bunting vs Lazuli Bunting
- Blue Grosbeak vs Lazuli Bunting
- Dickcissel vs Lazuli Bunting
- Indigo Bunting vs Painted Bunting
- Blue Grosbeak vs Painted Bunting
- Dickcissel vs Painted Bunting
- Lazuli Bunting vs Painted Bunting
- Northern Cardinal vs Pyrrhuloxia
- Dickcissel vs Pyrrhuloxia
- Blue-black Grosbeak vs Ultramarine Grosbeak
- Golden Grosbeak vs Rose-breasted Grosbeak
- Black-headed Grosbeak vs Golden Grosbeak
- Blue Bunting vs Golden Grosbeak
- Blue Bunting vs Ultramarine Grosbeak
- Black-faced Grosbeak vs Blue Bunting
- Flame-colored Tanager vs White-winged Tanager
- Black-backed Grosbeak vs Rose-breasted Grosbeak
- Black-backed Grosbeak vs Black-headed Grosbeak
- Black-backed Grosbeak vs Golden Grosbeak
- Carmiol's Tanager vs Ochre-breasted Tanager
- Orange-breasted Bunting vs Painted Bunting
- Northern Cardinal vs Vermilion Cardinal
- Pyrrhuloxia vs Vermilion Cardinal
- Amazonian Grosbeak vs Blue-black Grosbeak
- Amazonian Grosbeak vs Ultramarine Grosbeak
- Flame-colored Tanager vs Rose-throated Tanager
- Rose-throated Tanager vs White-winged Tanager
- Flame-colored Tanager vs Red-headed Tanager
- Red-headed Tanager vs White-winged Tanager
- Red-headed Tanager vs Rose-throated Tanager
- Blue-black Grosbeak vs Glaucous-blue Grosbeak
- Glaucous-blue Grosbeak vs Ultramarine Grosbeak
- Amazonian Grosbeak vs Glaucous-blue Grosbeak
- Grey-throated Chat vs Red-breasted Chat
Chats, Old World Flycatchers, and Allies
- European Pied Flycatcher vs European Robin
- Black Redstart vs European Robin
- European Robin vs European Stonechat
- Black Redstart vs Common Redstart
- European Stonechat vs Whinchat
- Bluethroat vs Common Nightingale
- Indian Robin vs Oriental Magpie-Robin
- Common Nightingale vs Thrush Nightingale
- Bluethroat vs Thrush Nightingale
- European Stonechat vs Pied Bush Chat
- Pied Bush Chat vs Whinchat
- African Stonechat vs European Stonechat
- African Stonechat vs Whinchat
- African Stonechat vs Pied Bush Chat
- Pied Bush Chat vs Siberian Stonechat
- African Stonechat vs Siberian Stonechat
- Fiscal Flycatcher vs Siberian Stonechat
- Fiscal Flycatcher vs Tickell's Blue Flycatcher
- European Pied Flycatcher vs Red-breasted Flycatcher
- Fiscal Flycatcher vs Red-breasted Flycatcher
- Oriental Magpie-Robin vs White-rumped Shama
- Indian Robin vs White-rumped Shama
- Asian Brown Flycatcher vs Spotted Flycatcher
- Familiar Chat vs Northern Wheatear
- Isabelline Wheatear vs Northern Wheatear
- Familiar Chat vs Isabelline Wheatear
- Black Redstart vs Plumbeous Water Redstart
- Common Redstart vs Plumbeous Water Redstart
- African Dusky Flycatcher vs Spotted Flycatcher
- African Dusky Flycatcher vs Asian Brown Flycatcher
- Northern Wheatear vs Western Black-eared Wheatear
- Familiar Chat vs Western Black-eared Wheatear
- Isabelline Wheatear vs Western Black-eared Wheatear
- Brown Rock Chat vs Familiar Chat
- Brown Rock Chat vs Isabelline Wheatear
- Brown Rock Chat vs Western Black-eared Wheatear
- Desert Wheatear vs Isabelline Wheatear
- Desert Wheatear vs Western Black-eared Wheatear
- Brown Rock Chat vs Desert Wheatear
- Capped Wheatear vs Western Black-eared Wheatear
- Brown Rock Chat vs Capped Wheatear
- Capped Wheatear vs Desert Wheatear
- Ant-eating Chat vs Mountain Chat
- Plumbeous Water Redstart vs White-capped Redstart
- Red-capped Robin-Chat vs White-browed Robin-Chat
- Blue Whistling Thrush vs Taiwan Whistling Thrush
- Blue Rock Thrush vs Common Rock Thrush
- Rufous-tailed Scrub Robin vs White-browed Scrub Robin
- Mocking Cliff Chat vs Rufous-tailed Scrub Robin
- Ashy Flycatcher vs Mocking Cliff Chat
- Blue Rock Thrush vs Cape Rock Thrush
- Cape Rock Thrush vs Common Rock Thrush
- Black Wheatear vs Pied Wheatear
- Blackstart vs Pied Wheatear
- Black Wheatear vs Blackstart
- Dark-sided Flycatcher vs Spotted Flycatcher
- Asian Brown Flycatcher vs Dark-sided Flycatcher
- African Dusky Flycatcher vs Dark-sided Flycatcher
- Blue-capped Rock Thrush vs Blue Rock Thrush
- Blue-capped Rock Thrush vs Common Rock Thrush
- Blue-capped Rock Thrush vs Cape Rock Thrush
- Asian Brown Flycatcher vs Brown-breasted Flycatcher
- African Dusky Flycatcher vs Brown-breasted Flycatcher
- Brown-breasted Flycatcher vs Dark-sided Flycatcher
- African Dusky Flycatcher vs Grey-streaked Flycatcher
- Dark-sided Flycatcher vs Grey-streaked Flycatcher
- Brown-breasted Flycatcher vs Grey-streaked Flycatcher
- Collared Bush Robin vs Red-flanked Bluetail
- Chestnut-bellied Rock Thrush vs Common Rock Thrush
- Cape Rock Thrush vs Chestnut-bellied Rock Thrush
- Blue-capped Rock Thrush vs Chestnut-bellied Rock Thrush
- Pied Wheatear vs White-crowned Wheatear
- Black Wheatear vs White-crowned Wheatear
- Blackstart vs White-crowned Wheatear
- Blue-throated Blue Flycatcher vs Tickell's Blue Flycatcher
- Chorister Robin-Chat vs White-browed Robin-Chat
- Chorister Robin-Chat vs Red-capped Robin-Chat
- Variable Wheatear vs White-crowned Wheatear
- Mugimaki Flycatcher vs Yellow-rumped Flycatcher
- Little Forktail vs Slaty-backed Forktail
- Ant-eating Chat vs Sooty Chat
- Mountain Chat vs Sooty Chat
- Sooty Chat vs White-starred Robin
- Mourning Wheatear vs Variable Wheatear
- Mourning Wheatear vs White-starred Robin
- Karoo Chat vs Sickle-winged Chat
- Slaty-backed Forktail vs White-crowned Forktail
- Little Forktail vs White-crowned Forktail
- Bearded Scrub Robin vs Karoo Scrub Robin
- Madagascar Magpie-Robin vs Oriental Magpie-Robin
- Indian Robin vs Madagascar Magpie-Robin
- Madagascar Magpie-Robin vs White-rumped Shama
- Blue-throated Blue Flycatcher vs White-bellied Blue Flycatcher
- Finsch's Wheatear vs Variable Wheatear
- Finsch's Wheatear vs Mourning Wheatear
- Finsch's Wheatear vs Silverbird
- Mourning Wheatear vs Red-tailed Wheatear
- Finsch's Wheatear vs Red-tailed Wheatear
- Hume's Wheatear vs Mourning Wheatear
- Finsch's Wheatear vs Hume's Wheatear
- Hume's Wheatear vs Red-tailed Wheatear
- Golden Bush Robin vs Red-flanked Bluetail
- Collared Bush Robin vs Golden Bush Robin
- Black-backed Forktail vs White-crowned Forktail
- Reunion Stonechat vs Siberian Stonechat
- Hooded Wheatear vs Hume's Wheatear
- Arnot's Chat vs Sooty Chat
- Andaman Shama vs White-rumped Shama
- Andaman Shama vs Madagascar Magpie-Robin
- Himalayan Rubythroat vs Siberian Rubythroat
Cisticolas and Allies
- Ashy Prinia vs Plain Prinia
- Plain Prinia vs Tawny-flanked Prinia
- Ashy Prinia vs Tawny-flanked Prinia
- Golden-headed Cisticola vs Zitting Cisticola
- Grey-breasted Prinia vs Tawny-flanked Prinia
- Neddicky vs Zitting Cisticola
- Golden-headed Cisticola vs Neddicky
- Golden-headed Cisticola vs Levaillant's Cisticola
- Levaillant's Cisticola vs Neddicky
- Black-chested Prinia vs Grey-breasted Prinia
- Grey-breasted Prinia vs Karoo Prinia
- Black-chested Prinia vs Karoo Prinia
- Rock-loving Cisticola vs Rufous-eared Warbler
- Drakensberg Prinia vs Jungle Prinia
- Drakensberg Prinia vs Himalayan Prinia
- Grey-capped Warbler vs Himalayan Prinia
- Drakensberg Prinia vs Rufous-fronted Prinia
- Himalayan Prinia vs Rufous-fronted Prinia
- Namaqua Warbler vs Rufous-fronted Prinia
- Senegal Eremomela vs Yellow-bellied Eremomela
- Namaqua Warbler vs Senegal Eremomela
- Bar-throated Apalis vs Grey Apalis
- Chestnut-throated Apalis vs Grey Apalis
- Madagascar Cisticola vs Whistling Cisticola
- Pectoral-patch Cisticola vs Whistling Cisticola
Cockatoos
- Galah vs Sulphur-crested Cockatoo
- Galah vs Little Corella
- Little Corella vs Sulphur-crested Cockatoo
- Galah vs Yellow-tailed Black Cockatoo
- Long-billed Corella vs Sulphur-crested Cockatoo
- Little Corella vs Long-billed Corella
- Gang-gang Cockatoo vs Red-tailed Black Cockatoo
- Cockatiel vs Gang-gang Cockatoo
- Cockatiel vs Red-tailed Black Cockatoo
- Glossy Black Cockatoo vs Red-tailed Black Cockatoo
- Gang-gang Cockatoo vs Glossy Black Cockatoo
- Cockatiel vs Glossy Black Cockatoo
- Carnaby's Black Cockatoo vs Yellow-tailed Black Cockatoo
- Pink Cockatoo vs Sulphur-crested Cockatoo
- Little Corella vs Pink Cockatoo
- Long-billed Corella vs Pink Cockatoo
- Little Corella vs Tanimbar Corella
- Long-billed Corella vs Tanimbar Corella
- Pink Cockatoo vs Tanimbar Corella
- Palm Cockatoo vs Tanimbar Corella
Cormorants and Shags
- Double-crested Cormorant vs Neotropic Cormorant
- Little Cormorant vs Little Pied Cormorant
- Brandt's Cormorant vs Pelagic Cormorant
- Great Cormorant vs Little Black Cormorant
- European Shag vs Little Black Cormorant
- Brandt's Cormorant vs European Shag
- Little Pied Cormorant vs Reed Cormorant
- Little Cormorant vs Reed Cormorant
- European Shag vs Reed Cormorant
- Australian Pied Cormorant vs Great Cormorant
- Australian Pied Cormorant vs Little Black Cormorant
- Great Cormorant vs Indian Cormorant
- Indian Cormorant vs Little Black Cormorant
- Australian Pied Cormorant vs Indian Cormorant
- Cape Cormorant vs Little Black Cormorant
- Australian Pied Cormorant vs Cape Cormorant
- Cape Cormorant vs Indian Cormorant
- Indian Cormorant vs Spotted Shag
- Cape Cormorant vs Spotted Shag
- Red-legged Cormorant vs Spotted Shag
- Black-faced Cormorant vs Cape Cormorant
- Black-faced Cormorant vs Spotted Shag
- Black-faced Cormorant vs Red-legged Cormorant
- Imperial Shag vs Rock Shag
- Red-legged Cormorant vs Rock Shag
- Guanay Cormorant vs Imperial Shag
- Guanay Cormorant vs Rock Shag
- Pelagic Cormorant vs Red-faced Cormorant
- Brandt's Cormorant vs Red-faced Cormorant
- Crowned Cormorant vs Reed Cormorant
- Crowned Cormorant vs Little Cormorant
- Imperial Shag vs Stewart Island Shag
- Rock Shag vs Stewart Island Shag
- Guanay Cormorant vs Stewart Island Shag
- Bank Cormorant vs Spotted Shag
- Bank Cormorant vs Black-faced Cormorant
- Double-crested Cormorant vs Flightless Cormorant
- Flightless Cormorant vs Neotropic Cormorant
Cotingas
- Purple-throated Fruitcrow vs Rufous-tailed Plantcutter
- Purple-throated Fruitcrow vs Screaming Piha
- Andean Cock-of-the-rock vs Purple-throated Fruitcrow
- Rufous-tailed Plantcutter vs White-tipped Plantcutter
- Rufous Piha vs Screaming Piha
- Bare-necked Fruitcrow vs Rufous Piha
- Bare-throated Bellbird vs Three-wattled Bellbird
- Bare-necked Fruitcrow vs Three-wattled Bellbird
- Bare-necked Fruitcrow vs Red-ruffed Fruitcrow
- Red-ruffed Fruitcrow vs Three-wattled Bellbird
- Red-ruffed Fruitcrow vs Rufous Piha
- Barred Fruiteater vs Green-and-black Fruiteater
- Green-and-black Fruiteater vs Orange-breasted Fruiteater
- Barred Fruiteater vs Orange-breasted Fruiteater
- Golden-breasted Fruiteater vs Green-and-black Fruiteater
- Barred Fruiteater vs Golden-breasted Fruiteater
- Golden-breasted Fruiteater vs Orange-breasted Fruiteater
- Blue Cotinga vs Spangled Cotinga
- Plum-throated Cotinga vs Spangled Cotinga
- Blue Cotinga vs Plum-throated Cotinga
- Bare-throated Bellbird vs Bearded Bellbird
- Bearded Bellbird vs Three-wattled Bellbird
- Spangled Cotinga vs Turquoise Cotinga
- Blue Cotinga vs Turquoise Cotinga
- Plum-throated Cotinga vs Turquoise Cotinga
- Dusky Piha vs Screaming Piha
- Dusky Piha vs Rufous Piha
- Amazonian Umbrellabird vs Long-wattled Umbrellabird
Coursers and Pratincoles
- Collared Pratincole vs Oriental Pratincole
- Collared Pratincole vs Small Pratincole
- Oriental Pratincole vs Small Pratincole
- Australian Pratincole vs Collared Pratincole
- Australian Pratincole vs Oriental Pratincole
- Australian Pratincole vs Small Pratincole
- Australian Pratincole vs Double-banded Courser
- Cream-colored Courser vs Double-banded Courser
- Black-winged Pratincole vs Small Pratincole
- Australian Pratincole vs Black-winged Pratincole
- Cream-colored Courser vs Indian Courser
- Rock Pratincole vs Small Pratincole
- Australian Pratincole vs Rock Pratincole
- Black-winged Pratincole vs Rock Pratincole
Cranes
- Brolga vs Sandhill Crane
- Common Crane vs Whooping Crane
- Blue Crane vs Common Crane
- Blue Crane vs Whooping Crane
- Sandhill Crane vs Sarus Crane
- Brolga vs Sarus Crane
- Common Crane vs Demoiselle Crane
- Demoiselle Crane vs Whooping Crane
- Blue Crane vs Demoiselle Crane
- Wattled Crane vs Whooping Crane
- Blue Crane vs Wattled Crane
- Demoiselle Crane vs Wattled Crane
- Sandhill Crane vs White-naped Crane
- Brolga vs White-naped Crane
- Sarus Crane vs White-naped Crane
- Demoiselle Crane vs Hooded Crane
- Hooded Crane vs Wattled Crane
- Black-necked Crane vs Demoiselle Crane
- Black-necked Crane vs Wattled Crane
- Black-necked Crane vs Hooded Crane
- Hooded Crane vs Red-crowned Crane
- Black-necked Crane vs Red-crowned Crane
- Red-crowned Crane vs Wattled Crane
Crescentchests
Crows, Jays, and Magpies
- American Crow vs Northern Raven
- American Crow vs Carrion Crow
- Carrion Crow vs Northern Raven
- American Crow vs Fish Crow
- Fish Crow vs Northern Raven
- Carrion Crow vs Fish Crow
- Blue Jay vs Steller's Jay
- Black-billed Magpie vs Eurasian Magpie
- Large-billed Crow vs Northern Raven
- Carrion Crow vs Large-billed Crow
- Fish Crow vs Large-billed Crow
- Carrion Crow vs House Crow
- Fish Crow vs House Crow
- House Crow vs Large-billed Crow
- Large-billed Crow vs Rook
- House Crow vs Rook
- Australian Raven vs Large-billed Crow
- Australian Raven vs House Crow
- Australian Raven vs Rook
- California Scrub Jay vs Woodhouse's Scrub Jay
- Australian Raven vs Little Raven
- Australian Raven vs Torresian Crow
- Little Raven vs Torresian Crow
- Australian Raven vs Pied Crow
- Little Raven vs Pied Crow
- Pied Crow vs Torresian Crow
- Brown Jay vs Green Jay
- Grey Treepie vs Rufous Treepie
- Clark's Nutcracker vs Northern Nutcracker
- Eurasian Magpie vs Oriental Magpie
- Black-billed Magpie vs Oriental Magpie
- California Scrub Jay vs Mexican Jay
- Mexican Jay vs Woodhouse's Scrub Jay
- Eurasian Magpie vs Yellow-billed Magpie
- Black-billed Magpie vs Yellow-billed Magpie
- Oriental Magpie vs Yellow-billed Magpie
- Canada Jay vs Siberian Jay
- Cape Crow vs Chihuahuan Raven
- Green Jay vs White-throated Magpie-Jay
- Brown Jay vs White-throated Magpie-Jay
- Pinyon Jay vs White-throated Magpie-Jay
- Black-chested Jay vs Green Jay
- Black-chested Jay vs Brown Jay
- Black-chested Jay vs White-throated Magpie-Jay
- Black-chested Jay vs Pinyon Jay
- Violaceous Jay vs White-throated Magpie-Jay
- Pinyon Jay vs Violaceous Jay
- Black-chested Jay vs Violaceous Jay
- Chihuahuan Raven vs White-necked Raven
- Cape Crow vs White-necked Raven
- Chihuahuan Raven vs Forest Raven
- Cape Crow vs Forest Raven
- Forest Raven vs White-necked Raven
- Plush-crested Jay vs White-throated Magpie-Jay
- Black-chested Jay vs Plush-crested Jay
- Plush-crested Jay vs Violaceous Jay
- Alpine Chough vs Red-billed Chough
- Bushy-crested Jay vs Plush-crested Jay
- Bushy-crested Jay vs Yucatan Jay
- Bushy-crested Jay vs Purplish Jay
- Purplish Jay vs Yucatan Jay
- California Scrub Jay vs Florida Scrub Jay
- Florida Scrub Jay vs Woodhouse's Scrub Jay
- Florida Scrub Jay vs Mexican Jay
- Red-billed Blue Magpie vs Taiwan Blue Magpie
- Brown-necked Raven vs Forest Raven
- Red-billed Blue Magpie vs Yellow-billed Blue Magpie
- Taiwan Blue Magpie vs Yellow-billed Blue Magpie
- Brown-necked Raven vs Little Crow
- Brown-necked Raven vs Collared Crow
- Collared Crow vs Little Crow
- Rufous Treepie vs White-bellied Treepie
- Grey Treepie vs White-bellied Treepie
- Clark's Nutcracker vs Southern Nutcracker
- Northern Nutcracker vs Southern Nutcracker
- Piapiac vs Southern Nutcracker
- Brown-necked Raven vs Sinaloa Crow
- Little Crow vs Sinaloa Crow
- Collared Crow vs Sinaloa Crow
- Piapiac vs Sinaloa Crow
- Black-headed Jay vs Eurasian Jay
- Collared Crow vs Fan-tailed Raven
- Fan-tailed Raven vs Sinaloa Crow
- Black-throated Magpie-Jay vs San Blas Jay
- Black-collared Jay vs Turquoise Jay
- Azure-hooded Jay vs Turquoise Jay
- Azure-hooded Jay vs Black-collared Jay
- Daurian Jackdaw vs Western Jackdaw
- Cuban Crow vs Fan-tailed Raven
- San Blas Jay vs White-tailed Jay
- Unicolored Jay vs Woodhouse's Scrub Jay
- Mexican Jay vs Unicolored Jay
- Florida Scrub Jay vs Unicolored Jay
- Island Scrub Jay vs Mexican Jay
- Florida Scrub Jay vs Island Scrub Jay
- Island Scrub Jay vs Unicolored Jay
- Black-billed Magpie vs Maghreb Magpie
- Maghreb Magpie vs Oriental Magpie
- Maghreb Magpie vs Yellow-billed Magpie
- Cuban Crow vs White-necked Crow
- Florida Scrub Jay vs Transvolcanic Jay
- Transvolcanic Jay vs Unicolored Jay
- Island Scrub Jay vs Transvolcanic Jay
- Turquoise Jay vs White-collared Jay
- Black-collared Jay vs White-collared Jay
- Azure-hooded Jay vs White-collared Jay
Cuban Warblers
Cuckoos
- Groove-billed Ani vs Smooth-billed Ani
- Black-billed Cuckoo vs Yellow-billed Cuckoo
- Common Hawk-Cuckoo vs Guira Cuckoo
- Black-billed Cuckoo vs Guira Cuckoo
- Fan-tailed Cuckoo vs Guira Cuckoo
- Greater Coucal vs White-browed Coucal
- Asian Koel vs Pacific Koel
- Greater Ani vs Smooth-billed Ani
- Greater Ani vs Groove-billed Ani
- Common Cuckoo vs Red-chested Cuckoo
- Greater Coucal vs Pheasant Coucal
- Pheasant Coucal vs White-browed Coucal
- Channel-billed Cuckoo vs Pheasant Coucal
- Diederik Cuckoo vs Klaas's Cuckoo
- Channel-billed Cuckoo vs Klaas's Cuckoo
- Fan-tailed Cuckoo vs Sahul Brush Cuckoo
- Channel-billed Cuckoo vs Sahul Brush Cuckoo
- Greater Coucal vs Lesser Coucal
- Lesser Coucal vs White-browed Coucal
- Lesser Coucal vs Pheasant Coucal
- Fan-tailed Cuckoo vs Plaintive Cuckoo
- Plaintive Cuckoo vs Sahul Brush Cuckoo
- Mangrove Cuckoo vs Yellow-billed Cuckoo
- Black-billed Cuckoo vs Mangrove Cuckoo
- Common Cuckoo vs Indian Cuckoo
- Indian Cuckoo vs Red-chested Cuckoo
- Great Spotted Cuckoo vs Jacobin Cuckoo
- Great Spotted Cuckoo vs Pallid Cuckoo
- Green-billed Malkoha vs Pallid Cuckoo
- Blue-faced Malkoha vs Pallid Cuckoo
- Blue-faced Malkoha vs Green-billed Malkoha
- Fan-tailed Cuckoo vs Grey-bellied Cuckoo
- Grey-bellied Cuckoo vs Sahul Brush Cuckoo
- Grey-bellied Cuckoo vs Plaintive Cuckoo
- Black Cuckoo vs Common Cuckoo
- Black Cuckoo vs Red-chested Cuckoo
- Black Cuckoo vs Indian Cuckoo
- Senegal Coucal vs White-browed Coucal
- Pheasant Coucal vs Senegal Coucal
- Lesser Coucal vs Senegal Coucal
- Little Bronze Cuckoo vs Shining Bronze Cuckoo
- Banded Bay Cuckoo vs Sahul Brush Cuckoo
- Banded Bay Cuckoo vs Plaintive Cuckoo
- Banded Bay Cuckoo vs Grey-bellied Cuckoo
- African Emerald Cuckoo vs Diederik Cuckoo
- African Emerald Cuckoo vs Klaas's Cuckoo
- Oriental Cuckoo vs Red-chested Cuckoo
- Indian Cuckoo vs Oriental Cuckoo
- Black Cuckoo vs Oriental Cuckoo
- Lesser Ground Cuckoo vs Oriental Cuckoo
- African Emerald Cuckoo vs Lesser Ground Cuckoo
- Jacobin Cuckoo vs Levaillant's Cuckoo
- Great Spotted Cuckoo vs Levaillant's Cuckoo
- Lesser Ground Cuckoo vs Levaillant's Cuckoo
- Dark-billed Cuckoo vs Yellow-billed Cuckoo
- Black-billed Cuckoo vs Dark-billed Cuckoo
- Dark-billed Cuckoo vs Mangrove Cuckoo
- Himalayan Cuckoo vs Indian Cuckoo
- Black Cuckoo vs Himalayan Cuckoo
- Himalayan Cuckoo vs Oriental Cuckoo
- Black-billed Cuckoo vs Great Lizard Cuckoo
- Great Lizard Cuckoo vs Mangrove Cuckoo
- Dark-billed Cuckoo vs Great Lizard Cuckoo
- Mangrove Cuckoo vs Puerto Rican Lizard Cuckoo
- Dark-billed Cuckoo vs Puerto Rican Lizard Cuckoo
- Great Lizard Cuckoo vs Puerto Rican Lizard Cuckoo
- African Cuckoo vs Oriental Cuckoo
- African Cuckoo vs Himalayan Cuckoo
- Chestnut-breasted Malkoha vs Green-billed Malkoha
- Blue-faced Malkoha vs Chestnut-breasted Malkoha
- Dark-billed Cuckoo vs Hispaniolan Lizard Cuckoo
- Great Lizard Cuckoo vs Hispaniolan Lizard Cuckoo
- Hispaniolan Lizard Cuckoo vs Puerto Rican Lizard Cuckoo
- Andaman Coucal vs Senegal Coucal
- Diederik Cuckoo vs Violet Cuckoo
- Klaas's Cuckoo vs Violet Cuckoo
- African Emerald Cuckoo vs Violet Cuckoo
- Malagasy Coucal vs Senegal Coucal
- Andaman Coucal vs Malagasy Coucal
- Malagasy Coucal vs Sirkeer Malkoha
- Chestnut-winged Cuckoo vs Jacobin Cuckoo
- Chestnut-winged Cuckoo vs Great Spotted Cuckoo
- Chestnut-winged Cuckoo vs Levaillant's Cuckoo
- Chestnut-winged Cuckoo vs Sirkeer Malkoha
- Greater Roadrunner vs Lesser Roadrunner
- Lesser Roadrunner vs Sirkeer Malkoha
- Andaman Coucal vs Blue-headed Coucal
- Blue-headed Coucal vs Malagasy Coucal
- Coppery-tailed Coucal vs Malagasy Coucal
- Blue-headed Coucal vs Coppery-tailed Coucal
- Andaman Coucal vs Coppery-tailed Coucal
- Black-eared Cuckoo vs Shining Bronze Cuckoo
- Black-eared Cuckoo vs Little Bronze Cuckoo
- Black-bellied Cuckoo vs Common Squirrel Cuckoo
- Black-bellied Cuckoo vs Long-tailed Koel
- African Cuckoo vs Madagascar Cuckoo
- Long-tailed Koel vs Madagascar Cuckoo
- Pavonine Cuckoo vs Pheasant Cuckoo
- African Emerald Cuckoo vs Asian Emerald Cuckoo
- Asian Emerald Cuckoo vs Violet Cuckoo
Cuckooshrikes
- Grey-chinned Minivet vs Small Minivet
- Black-faced Cuckooshrike vs White-bellied Cuckooshrike
- Scarlet Minivet vs Small Minivet
- Grey-chinned Minivet vs Scarlet Minivet
- Black-faced Cuckooshrike vs Indian Cuckooshrike
- Indian Cuckooshrike vs White-bellied Cuckooshrike
- Ashy Minivet vs Scarlet Minivet
- Black-headed Cuckooshrike vs Black-winged Cuckooshrike
- Ground Cuckooshrike vs Indian Cuckooshrike
- Bar-bellied Cuckooshrike vs Ground Cuckooshrike
Cupwings
Dippers
Doves and Pigeons
- Common Wood Pigeon vs Rock Dove
- Mourning Dove vs White-winged Dove
- Laughing Dove vs Spotted Dove
- Rock Dove vs Stock Dove
- Common Wood Pigeon vs Stock Dove
- Eared Dove vs Mourning Dove
- Eared Dove vs White-winged Dove
- Common Ground Dove vs Ruddy Ground Dove
- Inca Dove vs Ruddy Ground Dove
- Common Ground Dove vs Inca Dove
- Crested Pigeon vs Inca Dove
- Common Ground Dove vs Crested Pigeon
- Band-tailed Pigeon vs Crested Pigeon
- Eurasian Collared Dove vs Ring-necked Dove
- Eurasian Collared Dove vs Red-eyed Dove
- Red-eyed Dove vs Ring-necked Dove
- Band-tailed Pigeon vs Picazuro Pigeon
- Eurasian Collared Dove vs European Turtle Dove
- European Turtle Dove vs Ring-necked Dove
- European Turtle Dove vs Red-eyed Dove
- Red Collared Dove vs Ring-necked Dove
- Red Collared Dove vs Red-eyed Dove
- European Turtle Dove vs Red Collared Dove
- European Turtle Dove vs Oriental Turtle Dove
- Oriental Turtle Dove vs Red Collared Dove
- Oriental Turtle Dove vs Red-eyed Dove
- Band-tailed Pigeon vs Pale-vented Pigeon
- Pale-vented Pigeon vs Picazuro Pigeon
- Rock Dove vs Speckled Pigeon
- Common Wood Pigeon vs Speckled Pigeon
- Speckled Pigeon vs Stock Dove
- Peaceful Dove vs Zebra Dove
- Band-tailed Pigeon vs Red-billed Pigeon
- Picazuro Pigeon vs Red-billed Pigeon
- Pale-vented Pigeon vs Red-billed Pigeon
- Bar-shouldered Dove vs Zebra Dove
- Bar-shouldered Dove vs Peaceful Dove
- Picui Ground Dove vs Ruddy Ground Dove
- Common Ground Dove vs Picui Ground Dove
- Inca Dove vs Picui Ground Dove
- Emerald-spotted Wood Dove vs Namaqua Dove
- Picazuro Pigeon vs Spot-winged Pigeon
- Pale-vented Pigeon vs Spot-winged Pigeon
- Red-billed Pigeon vs Spot-winged Pigeon
- Namaqua Dove vs Spot-winged Pigeon
- Mourning Dove vs Zenaida Dove
- White-winged Dove vs Zenaida Dove
- Eared Dove vs Zenaida Dove
- Namaqua Dove vs Zenaida Dove
- Picui Ground Dove vs Scaled Dove
- Spot-winged Pigeon vs White-crowned Pigeon
- West Peruvian Dove vs White-winged Dove
- Eared Dove vs West Peruvian Dove
- West Peruvian Dove vs Zenaida Dove
- Plumbeous Pigeon vs White-crowned Pigeon
- Plumbeous Pigeon vs Scaly-naped Pigeon
- Grey-fronted Dove vs White-tipped Dove
- Grey-fronted Dove vs Wonga Pigeon
- Green Imperial Pigeon vs Wonga Pigeon
- Scaled Pigeon vs Scaly-naped Pigeon
- Plumbeous Pigeon vs Scaled Pigeon
- Blue Ground Dove vs Scaled Pigeon
- Blue Ground Dove vs Pink-necked Green Pigeon
- Green Imperial Pigeon vs Torresian Imperial Pigeon
- African Olive Pigeon vs Common Wood Pigeon
- African Olive Pigeon vs Stock Dove
- African Olive Pigeon vs Speckled Pigeon
- Croaking Ground Dove vs Picui Ground Dove
- Croaking Ground Dove vs Scaled Dove
- Stock Dove vs White-headed Pigeon
- Speckled Pigeon vs White-headed Pigeon
- African Olive Pigeon vs White-headed Pigeon
- Diamond Dove vs Zebra Dove
- Diamond Dove vs Peaceful Dove
- Bar-shouldered Dove vs Diamond Dove
- Picui Ground Dove vs Plain-breasted Ground Dove
- Plain-breasted Ground Dove vs Scaled Dove
- Croaking Ground Dove vs Plain-breasted Ground Dove
- Green Imperial Pigeon vs Mountain Imperial Pigeon
- Mountain Imperial Pigeon vs Torresian Imperial Pigeon
- Grey-chested Dove vs White-tipped Dove
- Grey-chested Dove vs Grey-fronted Dove
- Topknot Pigeon vs Wompoo Fruit Dove
- Grey-chested Dove vs Topknot Pigeon
- Bare-eyed Pigeon vs Scaled Pigeon
- Bare-eyed Pigeon vs Topknot Pigeon
- Common Emerald Dove vs Pacific Emerald Dove
- Bare-eyed Pigeon vs Chilean Pigeon
- Grey-fronted Green Pigeon vs Pink-necked Green Pigeon
- Mourning Collared Dove vs Vinaceous Dove
- Grey-headed Dove vs White-tipped Dove
- Grey-fronted Dove vs Grey-headed Dove
- Grey-chested Dove vs Grey-headed Dove
- Pink-necked Green Pigeon vs White-bellied Green Pigeon
- Grey-fronted Green Pigeon vs White-bellied Green Pigeon
- Brush Bronzewing vs Common Bronzewing
- Grey-fronted Green Pigeon vs Thick-billed Green Pigeon
- Thick-billed Green Pigeon vs White-bellied Green Pigeon
- Bare-faced Ground Dove vs Black-winged Ground Dove
- Rose-crowned Fruit Dove vs Superb Fruit Dove
- Grey-fronted Green Pigeon vs Wedge-tailed Green Pigeon
- Wedge-tailed Green Pigeon vs White-bellied Green Pigeon
- Thick-billed Green Pigeon vs Wedge-tailed Green Pigeon
- Caribbean Dove vs Grey-fronted Dove
- Caribbean Dove vs Grey-chested Dove
- Caribbean Dove vs Grey-headed Dove
- Orange-breasted Green Pigeon vs Thick-billed Green Pigeon
- Orange-breasted Green Pigeon vs Wedge-tailed Green Pigeon
- Hill Pigeon vs Speckled Pigeon
- African Olive Pigeon vs Hill Pigeon
- Hill Pigeon vs White-headed Pigeon
- Brown Cuckoo-Dove vs Little Cuckoo-Dove
- Dusky Turtle Dove vs Mourning Collared Dove
- Dusky Turtle Dove vs Vinaceous Dove
- Croaking Ground Dove vs Ecuadorian Ground Dove
- Ecuadorian Ground Dove vs Plain-breasted Ground Dove
- Ecuadorian Ground Dove vs Lemon Dove
- Dusky Turtle Dove vs Lemon Dove
- Eared Dove vs Galapagos Dove
- Galapagos Dove vs Zenaida Dove
- Galapagos Dove vs West Peruvian Dove
- Barred Cuckoo-Dove vs Brown Cuckoo-Dove
- Barred Cuckoo-Dove vs Little Cuckoo-Dove
- Grey-chested Dove vs Pallid Dove
- Grey-headed Dove vs Pallid Dove
- Caribbean Dove vs Pallid Dove
- Lined Quail-Dove vs White-throated Quail-Dove
- Orange-breasted Green Pigeon vs Pin-tailed Green Pigeon
- White-faced Quail-Dove vs White-throated Quail-Dove
- Lined Quail-Dove vs White-faced Quail-Dove
- Hill Pigeon vs Snow Pigeon
- Bare-eyed Pigeon vs Dusky Pigeon
- Chilean Pigeon vs Dusky Pigeon
- Hill Pigeon vs Nilgiri Wood Pigeon
- Nilgiri Wood Pigeon vs Snow Pigeon
- Bruce's Green Pigeon vs Pin-tailed Green Pigeon
- Caribbean Dove vs Yungas Dove
- Pallid Dove vs Yungas Dove
- Sunda Collared Dove vs Vinaceous Dove
- Dusky Turtle Dove vs Sunda Collared Dove
- Buff-fronted Quail-Dove vs White-throated Quail-Dove
- Buff-fronted Quail-Dove vs Lined Quail-Dove
- Buff-fronted Quail-Dove vs White-faced Quail-Dove
- Amboyna Cuckoo-Dove vs Brown Cuckoo-Dove
- Amboyna Cuckoo-Dove vs Little Cuckoo-Dove
- Amboyna Cuckoo-Dove vs Barred Cuckoo-Dove
- Spinifex Pigeon vs Squatter Pigeon
- Little Cuckoo-Dove vs Philippine Cuckoo-Dove
- Barred Cuckoo-Dove vs Philippine Cuckoo-Dove
- Amboyna Cuckoo-Dove vs Philippine Cuckoo-Dove
- Bruce's Green Pigeon vs Whistling Green Pigeon
- Key West Quail-Dove vs Ruddy Quail-Dove
- Palau Fruit Dove vs Rose-crowned Fruit Dove
- Palau Fruit Dove vs Superb Fruit Dove
- Bridled Quail-Dove vs Ruddy Quail-Dove
- Bridled Quail-Dove vs Key West Quail-Dove
- Chilean Pigeon vs Plain Pigeon
- Dusky Pigeon vs Plain Pigeon
- Amboyna Cuckoo-Dove vs Sultan's Cuckoo-Dove
- Philippine Cuckoo-Dove vs Sultan's Cuckoo-Dove
- Snow Pigeon vs Speckled Wood Pigeon
- Nilgiri Wood Pigeon vs Speckled Wood Pigeon
- Chiriqui Quail-Dove vs Lined Quail-Dove
- Chiriqui Quail-Dove vs White-faced Quail-Dove
- Buff-fronted Quail-Dove vs Chiriqui Quail-Dove
- Black-winged Ground Dove vs Golden-spotted Ground Dove
- Bare-faced Ground Dove vs Golden-spotted Ground Dove
- Dusky Pigeon vs Ring-tailed Pigeon
- Plain Pigeon vs Ring-tailed Pigeon
- Barred Dove vs Diamond Dove
- Bar-shouldered Dove vs Barred Dove
- Barred Dove vs Peaceful Dove
Drongos
- Black Drongo vs Fork-tailed Drongo
- Black Drongo vs Greater Racket-tailed Drongo
- Fork-tailed Drongo vs Greater Racket-tailed Drongo
- Ashy Drongo vs Black Drongo
- Ashy Drongo vs Fork-tailed Drongo
- Ashy Drongo vs Greater Racket-tailed Drongo
- Bronzed Drongo vs Fork-tailed Drongo
- Bronzed Drongo vs Greater Racket-tailed Drongo
- Ashy Drongo vs Bronzed Drongo
- Bronzed Drongo vs Spangled Drongo
- Bronzed Drongo vs White-bellied Drongo
- Spangled Drongo vs White-bellied Drongo
- Lesser Racket-tailed Drongo vs White-bellied Drongo
- Crested Drongo vs Lesser Racket-tailed Drongo
- Andaman Drongo vs Lesser Racket-tailed Drongo
- Andaman Drongo vs Crested Drongo
- Andaman Drongo vs Crow-billed Drongo
Ducks, Swans, and Geese
- Green-winged Teal vs Mallard
- Bufflehead vs Common Goldeneye
- American Wigeon vs Gadwall
- Common Merganser vs Red-breasted Merganser
- Hooded Merganser vs Ring-necked Duck
- Mallard vs Northern Pintail
- Green-winged Teal vs Northern Pintail
- Hooded Merganser vs Northern Pintail
- Greylag Goose vs Hooded Merganser
- Blue-winged Teal vs Northern Shoveler
- American Black Duck vs Mallard
- American Black Duck vs Green-winged Teal
- American Black Duck vs Northern Pintail
- Lesser Scaup vs Ring-necked Duck
- Ring-necked Duck vs Tufted Duck
- Lesser Scaup vs Tufted Duck
- Eurasian Wigeon vs Gadwall
- American Wigeon vs Eurasian Wigeon
- Mute Swan vs Whooper Swan
- Redhead vs Ring-necked Duck
- Lesser Scaup vs Redhead
- Redhead vs Tufted Duck
- Greater Scaup vs Redhead
- Greater Scaup vs Long-tailed Duck
- Long-tailed Duck vs Surf Scoter
- Egyptian Goose vs Long-tailed Duck
- Egyptian Goose vs Surf Scoter
- Greylag Goose vs Snow Goose
- Egyptian Goose vs Snow Goose
- Greater White-fronted Goose vs Greylag Goose
- Egyptian Goose vs Greater White-fronted Goose
- Greater White-fronted Goose vs Snow Goose
- Common Pochard vs Redhead
- Common Pochard vs Greater Scaup
- Cinnamon Teal vs Northern Shoveler
- Blue-winged Teal vs Cinnamon Teal
- Mute Swan vs Trumpeter Swan
- Trumpeter Swan vs Whooper Swan
- Green-winged Teal vs Pacific Black Duck
- Northern Pintail vs Pacific Black Duck
- American Black Duck vs Pacific Black Duck
- Brant Goose vs Canada Goose
- Canvasback vs Redhead
- Canvasback vs Greater Scaup
- Canvasback vs Common Pochard
- Mute Swan vs Tundra Swan
- Tundra Swan vs Whooper Swan
- Trumpeter Swan vs Tundra Swan
- Cackling Goose vs Canada Goose
- Brant Goose vs Cackling Goose
- Barnacle Goose vs Canada Goose
- Barnacle Goose vs Brant Goose
- Barnacle Goose vs Cackling Goose
- Surf Scoter vs White-winged Scoter
- Maned Duck vs White-winged Scoter
- Common Scoter vs Surf Scoter
- Common Scoter vs White-winged Scoter
- Common Scoter vs Maned Duck
- Maned Duck vs Muscovy Duck
- Black Swan vs Whooper Swan
- Black Swan vs Trumpeter Swan
- Black Swan vs Tundra Swan
- Black Swan vs Muscovy Duck
- Mottled Duck vs Northern Pintail
- American Black Duck vs Mottled Duck
- Mottled Duck vs Pacific Black Duck
- Mottled Duck vs Muscovy Duck
- Black Scoter vs Surf Scoter
- Black Scoter vs White-winged Scoter
- Black Scoter vs Common Scoter
- Black Scoter vs Muscovy Duck
- Grey Teal vs Pacific Black Duck
- Grey Teal vs Mottled Duck
- Garganey vs Northern Shoveler
- Blue-winged Teal vs Garganey
- Cinnamon Teal vs Garganey
- Velvet Scoter vs White-winged Scoter
- Common Scoter vs Velvet Scoter
- Black Scoter vs Velvet Scoter
- Smew vs Velvet Scoter
- Barrow's Goldeneye vs Common Goldeneye
- Barrow's Goldeneye vs Bufflehead
- Barrow's Goldeneye vs Smew
- Harlequin Duck vs Smew
- Barrow's Goldeneye vs Harlequin Duck
- Chestnut Teal vs Pacific Black Duck
- Chestnut Teal vs Mottled Duck
- Chestnut Teal vs Grey Teal
- Chestnut Teal vs Harlequin Duck
- Indian Spot-billed Duck vs Mottled Duck
- Grey Teal vs Indian Spot-billed Duck
- Chestnut Teal vs Indian Spot-billed Duck
- Greylag Goose vs Pink-footed Goose
- Pink-footed Goose vs Snow Goose
- Greater White-fronted Goose vs Pink-footed Goose
- Chestnut Teal vs Yellow-billed Duck
- Indian Spot-billed Duck vs Yellow-billed Duck
- Chestnut Teal vs Eastern Spot-billed Duck
- Eastern Spot-billed Duck vs Indian Spot-billed Duck
- Eastern Spot-billed Duck vs Yellow-billed Duck
- Black-bellied Whistling Duck vs Lesser Whistling Duck
- Black-bellied Whistling Duck vs White-faced Whistling Duck
- Lesser Whistling Duck vs White-faced Whistling Duck
- Common Shelduck vs Ruddy Shelduck
- Yellow-billed Duck vs Yellow-billed Teal
- Eastern Spot-billed Duck vs Yellow-billed Teal
- Ross's Goose vs Snow Goose
- Greater White-fronted Goose vs Ross's Goose
- Pink-footed Goose vs Ross's Goose
- Yellow-billed Pintail vs Yellow-billed Teal
- Spur-winged Goose vs Yellow-billed Pintail
- Australian Shelduck vs Common Shelduck
- Australian Shelduck vs Ruddy Shelduck
- Australian Shelduck vs Spur-winged Goose
- Mandarin Duck vs Wood Duck
- Mandarin Duck vs Spur-winged Goose
- Black-bellied Whistling Duck vs Fulvous Whistling Duck
- Fulvous Whistling Duck vs Lesser Whistling Duck
- Fulvous Whistling Duck vs White-faced Whistling Duck
- Common Shelduck vs Paradise Shelduck
- Paradise Shelduck vs Ruddy Shelduck
- Australian Shelduck vs Paradise Shelduck
- Mexican Duck vs Yellow-billed Pintail
- Brazilian Teal vs Mexican Duck
- Brazilian Teal vs Paradise Shelduck
- Red-billed Teal vs Yellow-billed Pintail
- Mexican Duck vs Red-billed Teal
- Ferruginous Duck vs Hardhead
- Common Eider vs King Eider
- Mexican Duck vs White-cheeked Pintail
- Red-billed Teal vs White-cheeked Pintail
- Pink-footed Goose vs Tundra Bean Goose
- Ross's Goose vs Tundra Bean Goose
- Pink-footed Goose vs Taiga Bean Goose
- Ross's Goose vs Taiga Bean Goose
- Taiga Bean Goose vs Tundra Bean Goose
- Pink-eared Duck vs Taiga Bean Goose
- Pink-eared Duck vs Tundra Bean Goose
- Chiloe Wigeon vs Gadwall
- American Wigeon vs Chiloe Wigeon
- Chiloe Wigeon vs Eurasian Wigeon
- Chiloe Wigeon vs Pink-eared Duck
- Bar-headed Goose vs Ross's Goose
- Bar-headed Goose vs Tundra Bean Goose
- Bar-headed Goose vs Taiga Bean Goose
- Coscoroba Swan vs Upland Goose
- Bar-headed Goose vs Coscoroba Swan
- Coscoroba Swan vs Musk Duck
- Musk Duck vs Upland Goose
- Bar-headed Goose vs Musk Duck
- Crested Duck vs Musk Duck
- Crested Duck vs Knob-billed Duck
- Cotton Pygmy Goose vs Crested Duck
- Black-necked Swan vs Black Swan
- Black-necked Swan vs Tundra Swan
- Black-necked Swan vs Trumpeter Swan
- Ruddy Shelduck vs South African Shelduck
- Australian Shelduck vs South African Shelduck
- Paradise Shelduck vs South African Shelduck
- African Black Duck vs White-cheeked Pintail
- Garganey vs Silver Teal
- African Black Duck vs Cape Teal
- Lesser Whistling Duck vs Plumed Whistling Duck
- Plumed Whistling Duck vs White-faced Whistling Duck
- Fulvous Whistling Duck vs Plumed Whistling Duck
- Red Shoveler vs Silver Teal
- Blue-billed Duck vs Ruddy Duck
- Emperor Goose vs Tundra Bean Goose
- Emperor Goose vs Taiga Bean Goose
- Bar-headed Goose vs Emperor Goose
- Emperor Goose vs Swan Goose
- Bar-headed Goose vs Swan Goose
- Hardhead vs New Zealand Scaup
- Ferruginous Duck vs New Zealand Scaup
- Emperor Goose vs Lesser White-fronted Goose
- Lesser White-fronted Goose vs Swan Goose
- Bar-headed Goose vs Lesser White-fronted Goose
- Fulvous Whistling Duck vs Wandering Whistling Duck
- Plumed Whistling Duck vs Wandering Whistling Duck
- Ruddy Duck vs White-headed Duck
- Blue-billed Duck vs White-headed Duck
- Lake Duck vs Ruddy Duck
- Blue-billed Duck vs Lake Duck
- Lake Duck vs White-headed Duck
- Lake Duck vs Radjah Shelduck
- Radjah Shelduck vs Rosy-billed Pochard
- Blue-billed Teal vs Silver Teal
- Blue-billed Teal vs Red Shoveler
- Blue-billed Teal vs Radjah Shelduck
- Brant Goose vs Nene
- Cackling Goose vs Nene
- Barnacle Goose vs Nene
- Eurasian Wigeon vs Falcated Duck
- Chiloe Wigeon vs Falcated Duck
- American Wigeon vs Falcated Duck
- Cape Barren Goose vs Falcated Duck
- Cape Barren Goose vs Nene
- Cape Barren Goose vs Ringed Teal
- Falcated Duck vs Ringed Teal
- Nene vs Ringed Teal
- Andean Goose vs Upland Goose
- Andean Goose vs Steller's Eider
- Ringed Teal vs Steller's Eider
- Freckled Duck vs Steller's Eider
- Andean Goose vs Freckled Duck
- Nene vs Red-breasted Goose
- Freckled Duck vs Red-breasted Goose
- Barnacle Goose vs Red-breasted Goose
- Cackling Goose vs Red-breasted Goose
- Ashy-headed Goose vs Upland Goose
- Andean Goose vs Ashy-headed Goose
- Cotton Pygmy Goose vs Green Pygmy Goose
- Blue-billed Teal vs Puna Teal
- Puna Teal vs Red Shoveler
- Puna Teal vs Silver Teal
- Kelp Goose vs Upland Goose
- Andean Goose vs Kelp Goose
- Ashy-headed Goose vs Kelp Goose
- Kelp Goose vs White-backed Duck
- Flying Steamer Duck vs Fuegian Steamer Duck
- Fuegian Steamer Duck vs White-backed Duck
- Blue-billed Duck vs Maccoa Duck
- Maccoa Duck vs White-headed Duck
- Lake Duck vs Maccoa Duck
- Plumed Whistling Duck vs West Indian Whistling Duck
- Wandering Whistling Duck vs West Indian Whistling Duck
- Black-headed Duck vs West Indian Whistling Duck
- Baikal Teal vs Black-headed Duck
- African Pygmy Goose vs Cotton Pygmy Goose
- African Pygmy Goose vs Green Pygmy Goose
- African Pygmy Goose vs Black-headed Duck
- African Pygmy Goose vs Baikal Teal
- Baikal Teal vs Masked Duck
- African Pygmy Goose vs Masked Duck
- Black-headed Duck vs Masked Duck
- Andean Goose vs Ruddy-headed Goose
- Ashy-headed Goose vs Ruddy-headed Goose
- Kelp Goose vs Ruddy-headed Goose
- Brown Teal vs Cape Teal
- Brown Teal vs Hawaiian Duck
- Comb Duck vs Knob-billed Duck
- Falkland Steamer Duck vs Flying Steamer Duck
- Falkland Steamer Duck vs Fuegian Steamer Duck
- Stejneger's Scoter vs Velvet Scoter
- Black Scoter vs Stejneger's Scoter
- Common Scoter vs Stejneger's Scoter
Emu and Cassowaries
Fairy Flycatchers
Falcons and Caracaras
- American Kestrel vs Common Kestrel
- American Kestrel vs Peregrine Falcon
- Common Kestrel vs Peregrine Falcon
- American Kestrel vs Merlin
- Common Kestrel vs Merlin
- Merlin vs Peregrine Falcon
- Crested Caracara vs Merlin
- Crested Caracara vs Peregrine Falcon
- Eurasian Hobby vs Peregrine Falcon
- Eurasian Hobby vs Merlin
- Crested Caracara vs Eurasian Hobby
- Merlin vs Nankeen Kestrel
- Eurasian Hobby vs Nankeen Kestrel
- Laughing Falcon vs Nankeen Kestrel
- Eurasian Hobby vs Prairie Falcon
- Nankeen Kestrel vs Prairie Falcon
- Laughing Falcon vs Prairie Falcon
- Brown Falcon vs Eurasian Hobby
- Brown Falcon vs Nankeen Kestrel
- Brown Falcon vs Laughing Falcon
- Brown Falcon vs Prairie Falcon
- Bat Falcon vs Nankeen Kestrel
- Bat Falcon vs Prairie Falcon
- Bat Falcon vs Brown Falcon
- Brown Falcon vs Lesser Kestrel
- Bat Falcon vs Lesser Kestrel
- Aplomado Falcon vs Bat Falcon
- Aplomado Falcon vs Lesser Kestrel
- Lesser Kestrel vs Rock Kestrel
- Aplomado Falcon vs Rock Kestrel
- Aplomado Falcon vs Australian Hobby
- Australian Hobby vs Rock Kestrel
- Red-footed Falcon vs Rock Kestrel
- Australian Hobby vs Red-footed Falcon
- Amur Falcon vs Australian Hobby
- Amur Falcon vs Red-footed Falcon
- Lanner Falcon vs Red-footed Falcon
- Amur Falcon vs Lanner Falcon
- Barred Forest Falcon vs Collared Forest Falcon
- Barred Forest Falcon vs Red-throated Caracara
- Greater Kestrel vs Lanner Falcon
- Greater Kestrel vs Red-throated Caracara
- New Zealand Falcon vs Red-throated Caracara
- Greater Kestrel vs New Zealand Falcon
- Eleonora's Falcon vs Greater Kestrel
- Eleonora's Falcon vs New Zealand Falcon
- Greater Kestrel vs Grey Kestrel
- Grey Kestrel vs New Zealand Falcon
- Eleonora's Falcon vs Grey Kestrel
- Grey Kestrel vs Red-necked Falcon
- Black Falcon vs Grey Kestrel
- Black Falcon vs Red-necked Falcon
- Gyrfalcon vs Red-necked Falcon
- Black Falcon vs Gyrfalcon
- Grey Kestrel vs Gyrfalcon
- Gyrfalcon vs Pygmy Falcon
- Black Falcon vs Pygmy Falcon
- Pygmy Falcon vs Red-necked Falcon
- Black-thighed Falconet vs Collared Falconet
- African Hobby vs Malagasy Kestrel
- Collared Forest Falcon vs Lined Forest Falcon
- Barred Forest Falcon vs Lined Forest Falcon
Fantails and Silktails
- Grey Fantail vs Willie Wagtail
- New Zealand Fantail vs Willie Wagtail
- Grey Fantail vs New Zealand Fantail
- Australian Rufous Fantail vs New Zealand Fantail
- New Zealand Fantail vs White-spotted Fantail
- Australian Rufous Fantail vs White-spotted Fantail
- Australian Rufous Fantail vs White-throated Fantail
- White-spotted Fantail vs White-throated Fantail
- White-browed Fantail vs White-throated Fantail
Finches, Euphonias, and Allies
- American Goldfinch vs Lesser Goldfinch
- American Goldfinch vs Pine Siskin
- Lesser Goldfinch vs Pine Siskin
- Pine Siskin vs Redpoll
- House Finch vs Purple Finch
- Purple Finch vs Redpoll
- American Goldfinch vs Eurasian Siskin
- Eurasian Siskin vs Lesser Goldfinch
- Eurasian Siskin vs Pine Siskin
- Eurasian Siskin vs Redpoll
- Brambling vs Eurasian Chaffinch
- Hawfinch vs Red Crossbill
- European Serin vs Hawfinch
- Evening Grosbeak vs Hawfinch
- Cassin's Finch vs House Finch
- Cassin's Finch vs Purple Finch
- Cassin's Finch vs Pine Grosbeak
- Common Rosefinch vs Pine Grosbeak
- Red Crossbill vs Two-barred Crossbill
- Pine Grosbeak vs Two-barred Crossbill
- Thick-billed Euphonia vs Yellow-throated Euphonia
- Common Linnet vs Twite
- Hooded Siskin vs Lesser Goldfinch
- Hooded Siskin vs Pine Siskin
- Eurasian Siskin vs Hooded Siskin
- Purple-throated Euphonia vs Thick-billed Euphonia
- Purple-throated Euphonia vs Yellow-throated Euphonia
- Orange-bellied Euphonia vs Thick-billed Euphonia
- Orange-bellied Euphonia vs Yellow-throated Euphonia
- Orange-bellied Euphonia vs Purple-throated Euphonia
- Black-chinned Siskin vs Hooded Siskin
- Parrot Crossbill vs Red Crossbill
- Parrot Crossbill vs Two-barred Crossbill
- Purple-throated Euphonia vs Yellow-crowned Euphonia
- Orange-bellied Euphonia vs Yellow-crowned Euphonia
- European Greenfinch vs Oriental Greenfinch
- Olive-backed Euphonia vs Purple-throated Euphonia
- Olive-backed Euphonia vs Orange-bellied Euphonia
- Olive-backed Euphonia vs Yellow-crowned Euphonia
- Scrub Euphonia vs Yellow-crowned Euphonia
- Olive-backed Euphonia vs Scrub Euphonia
- Hooded Siskin vs Lawrence's Goldfinch
- Black-chinned Siskin vs Lawrence's Goldfinch
- Streaky-headed Seedeater vs Yellow Canary
- Violaceous Euphonia vs Yellow-crowned Euphonia
- Olive-backed Euphonia vs Violaceous Euphonia
- Scrub Euphonia vs Violaceous Euphonia
- Atlantic Canary vs European Serin
- Brimstone Canary vs Streaky-headed Seedeater
- Apapane vs Elegant Euphonia
- Brimstone Canary vs White-throated Canary
- Apapane vs White-throated Canary
- Apapane vs Golden-browed Chlorophonia
- Elegant Euphonia vs Golden-browed Chlorophonia
- Chestnut-bellied Euphonia vs Tawny-capped Euphonia
- Blue-naped Chlorophonia vs Elegant Euphonia
- Blue-naped Chlorophonia vs Golden-browed Chlorophonia
- Hooded Siskin vs Yellow-bellied Siskin
- Black-chinned Siskin vs Yellow-bellied Siskin
- Lawrence's Goldfinch vs Yellow-bellied Siskin
- Elegant Euphonia vs Golden-rumped Euphonia
- Golden-browed Chlorophonia vs Golden-rumped Euphonia
- Blue-naped Chlorophonia vs Golden-rumped Euphonia
- Black-headed Siskin vs Lawrence's Goldfinch
- Black-headed Siskin vs Yellow-bellied Siskin
- Chestnut-bellied Euphonia vs Trinidad Euphonia
- Tawny-capped Euphonia vs Trinidad Euphonia
- Trinidad Euphonia vs White-vented Euphonia
- Iiwi vs White-vented Euphonia
- Spot-crowned Euphonia vs Trinidad Euphonia
- Iiwi vs Spot-crowned Euphonia
- Spot-crowned Euphonia vs White-vented Euphonia
- Azores Chaffinch vs Eurasian Chaffinch
- Azores Chaffinch vs Brambling
- Andean Siskin vs Yellow-bellied Siskin
- Andean Siskin vs Black-headed Siskin
- Forest Canary vs White-throated Canary
- Black Rosy Finch vs Grey-crowned Rosy Finch
- Fulvous-vented Euphonia vs Rufous-bellied Euphonia
- European Greenfinch vs Yellow-breasted Greenfinch
- Oriental Greenfinch vs Yellow-breasted Greenfinch
- Bronze-green Euphonia vs Fulvous-vented Euphonia
- Bronze-green Euphonia vs Rufous-bellied Euphonia
- Black Siskin vs Yellow-bellied Siskin
- Black-headed Siskin vs Black Siskin
- Andean Siskin vs Black Siskin
- Fulvous-vented Euphonia vs West Mexican Euphonia
- Rufous-bellied Euphonia vs West Mexican Euphonia
- Bronze-green Euphonia vs West Mexican Euphonia
- Grey-crowned Rosy Finch vs Plain Mountain Finch
- Black Rosy Finch vs Plain Mountain Finch
- Desert Finch vs Plain Mountain Finch
- Blue-crowned Chlorophonia vs Desert Finch
- African Chaffinch vs Eurasian Chaffinch
- African Chaffinch vs Brambling
- African Chaffinch vs Azores Chaffinch
- Cape Siskin vs Forest Canary
- Evening Grosbeak vs Hooded Grosbeak
- Blue-crowned Chlorophonia vs Chestnut-breasted Chlorophonia
- Bronze-green Euphonia vs Velvet-fronted Euphonia
- Velvet-fronted Euphonia vs West Mexican Euphonia
- Common Rosefinch vs Pink-browed Rosefinch
- Black Siskin vs Olivaceous Siskin
- Chinese Grosbeak vs Japanese Grosbeak
- Blue-crowned Chlorophonia vs Yellow-collared Chlorophonia
- Chestnut-breasted Chlorophonia vs Yellow-collared Chlorophonia
- Bronze-green Euphonia vs Jamaican Euphonia
- Jamaican Euphonia vs West Mexican Euphonia
- Jamaican Euphonia vs Velvet-fronted Euphonia
- Orange-crowned Euphonia vs Velvet-fronted Euphonia
- Jamaican Euphonia vs Orange-crowned Euphonia
- Dark-breasted Rosefinch vs Orange-crowned Euphonia
- European Goldfinch vs Grey-crowned Goldfinch
- Dark-breasted Rosefinch vs Grey-crowned Goldfinch
- Black Siskin vs Yellow-rumped Siskin
- Olivaceous Siskin vs Yellow-rumped Siskin
- Brambling vs Canary Islands Chaffinch
- Azores Chaffinch vs Canary Islands Chaffinch
- African Chaffinch vs Canary Islands Chaffinch
- Green-chinned Euphonia vs Orange-crowned Euphonia
Finfoots
Flamingos
Flowerpeckers
- Mistletoebird vs Pale-billed Flowerpecker
- Pale-billed Flowerpecker vs Scarlet-backed Flowerpecker
- Mistletoebird vs Scarlet-backed Flowerpecker
- Nilgiri Flowerpecker vs Pale-billed Flowerpecker
- Mistletoebird vs Nilgiri Flowerpecker
- Nilgiri Flowerpecker vs Scarlet-backed Flowerpecker
- Fire-breasted Flowerpecker vs Scarlet-backed Flowerpecker
- Fire-breasted Flowerpecker vs Nilgiri Flowerpecker
- Orange-bellied Flowerpecker vs Scarlet-backed Flowerpecker
- Nilgiri Flowerpecker vs Orange-bellied Flowerpecker
- Fire-breasted Flowerpecker vs Orange-bellied Flowerpecker
- Fire-breasted Flowerpecker vs Plain Flowerpecker
- Orange-bellied Flowerpecker vs Plain Flowerpecker
- Red-capped Flowerpecker vs Scarlet-headed Flowerpecker
- Black-sided Flowerpecker vs Scarlet-headed Flowerpecker
Frigatebirds
Frogmouths
Gerygones, Thornbills, Scrubwrens, and Allies
- Brown Thornbill vs Yellow-rumped Thornbill
- Weebill vs Yellow-rumped Thornbill
- Grey Gerygone vs Weebill
- Brown Thornbill vs Striated Thornbill
- Striated Thornbill vs Yellow-rumped Thornbill
- Striated Thornbill vs Weebill
- Brown Thornbill vs Yellow Thornbill
- Yellow-rumped Thornbill vs Yellow Thornbill
- Striated Thornbill vs Yellow Thornbill
- Large-billed Scrubwren vs White-browed Scrubwren
- Grey Gerygone vs Western Gerygone
- Inland Thornbill vs Yellow Thornbill
- Chestnut-rumped Thornbill vs Inland Thornbill
- Speckled Warbler vs Yellow-throated Scrubwren
- Southern Whiteface vs Yellow-throated Scrubwren
- Fairy Gerygone vs Western Gerygone
- Inland Thornbill vs Tasmanian Thornbill
- Chestnut-rumped Thornbill vs Tasmanian Thornbill
- Pilotbird vs Tasmanian Thornbill
- Chestnut-rumped Heathwren vs Shy Heathwren
- Chestnut-rumped Heathwren vs Pilotbird
- Rufous Fieldwren vs Striated Fieldwren
- Tasmanian Thornbill vs Western Thornbill
Gnateaters
Gnatwrens and Gnatcatchers
- Black-tailed Gnatcatcher vs Blue-grey Gnatcatcher
- Blue-grey Gnatcatcher vs Tropical Gnatcatcher
- Black-tailed Gnatcatcher vs Tropical Gnatcatcher
- Blue-grey Gnatcatcher vs Masked Gnatcatcher
- Black-tailed Gnatcatcher vs Masked Gnatcatcher
- Masked Gnatcatcher vs Tropical Gnatcatcher
- Black-tailed Gnatcatcher vs California Gnatcatcher
- California Gnatcatcher vs Tropical Gnatcatcher
- California Gnatcatcher vs Masked Gnatcatcher
- Masked Gnatcatcher vs White-lored Gnatcatcher
- California Gnatcatcher vs White-lored Gnatcatcher
- Black-capped Gnatcatcher vs California Gnatcatcher
- Black-capped Gnatcatcher vs White-lored Gnatcatcher
- California Gnatcatcher vs Yucatan Gnatcatcher
- White-lored Gnatcatcher vs Yucatan Gnatcatcher
- Black-capped Gnatcatcher vs Yucatan Gnatcatcher
Grasshopper Warblers, Grassbirds, and Allies
- Common Grasshopper Warbler vs Savi's Warbler
- Rufous Songlark vs Tawny Grassbird
- Common Grasshopper Warbler vs River Warbler
- River Warbler vs Savi's Warbler
- Brown Songlark vs Rufous Songlark
- Brown Songlark vs Tawny Grassbird
- Little Grassbird vs New Zealand Fernbird
- Common Grasshopper Warbler vs Taiwan Bush Warbler
- Savi's Warbler vs Taiwan Bush Warbler
- River Warbler vs Taiwan Bush Warbler
- Barratt's Warbler vs Little Rush Warbler
- Knysna Warbler vs Little Rush Warbler
- Barratt's Warbler vs Knysna Warbler
Grasswrens, Fairywrens, and Emu-wrens
- Red-backed Fairywren vs Superb Fairywren
- Superb Fairywren vs Variegated Fairywren
- Red-backed Fairywren vs Variegated Fairywren
- Splendid Fairywren vs Superb Fairywren
- Red-backed Fairywren vs Splendid Fairywren
- Splendid Fairywren vs Variegated Fairywren
- Purple-backed Fairywren vs Red-backed Fairywren
- Purple-backed Fairywren vs Variegated Fairywren
- Purple-backed Fairywren vs Splendid Fairywren
- Splendid Fairywren vs White-winged Fairywren
- Purple-backed Fairywren vs White-winged Fairywren
- Red-winged Fairywren vs Splendid Fairywren
- Purple-backed Fairywren vs Red-winged Fairywren
- Red-winged Fairywren vs White-winged Fairywren
- Lovely Fairywren vs Red-winged Fairywren
Grauer's Broadbill and Asian Broadbills
Grebes
- Great Crested Grebe vs Pied-billed Grebe
- Little Grebe vs Pied-billed Grebe
- Horned Grebe vs Pied-billed Grebe
- Great Crested Grebe vs Horned Grebe
- Black-necked Grebe vs Great Crested Grebe
- Black-necked Grebe vs Horned Grebe
- Great Crested Grebe vs Red-necked Grebe
- Horned Grebe vs Red-necked Grebe
- Black-necked Grebe vs Red-necked Grebe
- Clark's Grebe vs Western Grebe
- Least Grebe vs Little Grebe
- Black-necked Grebe vs Great Grebe
- Great Grebe vs Red-necked Grebe
- Great Grebe vs Silvery Grebe
- Hoary-headed Grebe vs New Zealand Grebe
Guans, Curassows, and Chachalacas
- Grey-headed Chachalaca vs Plain Chachalaca
- Colombian Chachalaca vs Plain Chachalaca
- Colombian Chachalaca vs Grey-headed Chachalaca
- Plain Chachalaca vs Speckled Chachalaca
- Grey-headed Chachalaca vs Speckled Chachalaca
- Colombian Chachalaca vs Speckled Chachalaca
- Chaco Chachalaca vs Grey-headed Chachalaca
- Chaco Chachalaca vs Colombian Chachalaca
- Chaco Chachalaca vs Speckled Chachalaca
- Crested Guan vs Dusky-legged Guan
- Andean Guan vs Crested Guan
- Andean Guan vs Dusky-legged Guan
- Colombian Chachalaca vs Rufous-vented Chachalaca
- Rufous-vented Chachalaca vs Speckled Chachalaca
- Chaco Chachalaca vs Rufous-vented Chachalaca
- Black Guan vs Sickle-winged Guan
- Crested Guan vs Spix's Guan
- Dusky-legged Guan vs Spix's Guan
- Andean Guan vs Spix's Guan
- Chaco Chachalaca vs West Mexican Chachalaca
- Rufous-vented Chachalaca vs West Mexican Chachalaca
- Chaco Chachalaca vs Rufous-bellied Chachalaca
- Rufous-bellied Chachalaca vs Rufous-vented Chachalaca
- Rufous-bellied Chachalaca vs West Mexican Chachalaca
- Bare-faced Curassow vs Great Curassow
- Band-tailed Guan vs Dusky-legged Guan
- Andean Guan vs Band-tailed Guan
- Band-tailed Guan vs Spix's Guan
- Band-tailed Guan vs Wattled Guan
- West Mexican Chachalaca vs White-bellied Chachalaca
- Rufous-bellied Chachalaca vs White-bellied Chachalaca
- Wattled Guan vs White-bellied Chachalaca
- Highland Guan vs Wattled Guan
- Highland Guan vs White-bellied Chachalaca
- Band-tailed Guan vs Highland Guan
- Rusty-margined Guan vs Spix's Guan
- Band-tailed Guan vs Rusty-margined Guan
- Highland Guan vs Rusty-margined Guan
- Chestnut-winged Chachalaca vs West Mexican Chachalaca
- Chestnut-winged Chachalaca vs Rufous-bellied Chachalaca
- Chestnut-winged Chachalaca vs White-bellied Chachalaca
- Spix's Guan vs Yungas Guan
- Band-tailed Guan vs Yungas Guan
- Rusty-margined Guan vs Yungas Guan
- Scaled Chachalaca vs White-bellied Chachalaca
- Chestnut-winged Chachalaca vs Scaled Chachalaca
- Rufous-headed Chachalaca vs White-bellied Chachalaca
- Chestnut-winged Chachalaca vs Rufous-headed Chachalaca
- Rufous-headed Chachalaca vs Scaled Chachalaca
- Band-tailed Guan vs Chestnut-bellied Guan
- Chestnut-bellied Guan vs Rusty-margined Guan
- Chestnut-bellied Guan vs Yungas Guan
- Blue-throated Piping Guan vs Red-throated Piping Guan
- Cauca Guan vs Yungas Guan
- Cauca Guan vs Chestnut-bellied Guan
- Chestnut-winged Chachalaca vs Little Chachalaca
- Little Chachalaca vs Scaled Chachalaca
- Little Chachalaca vs Rufous-headed Chachalaca
- Black Curassow vs Great Curassow
- Bare-faced Curassow vs Black Curassow
Guineafowl
Herons, Egrets, and Bitterns
- Great Blue Heron vs Great Egret
- Great Blue Heron vs Grey Heron
- Great Egret vs Grey Heron
- Great Blue Heron vs Western Cattle Egret
- Great Egret vs Western Cattle Egret
- Grey Heron vs Western Cattle Egret
- Little Egret vs Snowy Egret
- Little Blue Heron vs Snowy Egret
- Little Blue Heron vs Little Egret
- Snowy Egret vs Tricolored Heron
- Little Egret vs Tricolored Heron
- Little Blue Heron vs Tricolored Heron
- Indian Pond Heron vs Yellow-crowned Night Heron
- Little Blue Heron vs White-faced Heron
- Tricolored Heron vs White-faced Heron
- White-faced Heron vs Yellow-crowned Night Heron
- Grey Heron vs Purple Heron
- Purple Heron vs Western Cattle Egret
- Purple Heron vs Yellow-crowned Night Heron
- Green Heron vs Striated Heron
- Reddish Egret vs Tricolored Heron
- Reddish Egret vs White-faced Heron
- American Bittern vs Eurasian Bittern
- Cocoi Heron vs Purple Heron
- Purple Heron vs White-necked Heron
- Cocoi Heron vs White-necked Heron
- Bare-throated Tiger Heron vs Whistling Heron
- Bare-throated Tiger Heron vs Rufescent Tiger Heron
- Rufescent Tiger Heron vs Whistling Heron
- Pacific Reef Heron vs White-faced Heron
- Pacific Reef Heron vs Reddish Egret
- Black-crowned Night Heron vs Nankeen Night Heron
- Western Reef Heron vs White-faced Heron
- Reddish Egret vs Western Reef Heron
- Pacific Reef Heron vs Western Reef Heron
- Cocoi Heron vs Goliath Heron
- Goliath Heron vs White-necked Heron
- Boat-billed Heron vs Goliath Heron
- Boat-billed Heron vs Malayan Night Heron
- Boat-billed Heron vs Western Reef Heron
- Black Heron vs Reddish Egret
- Black Heron vs Pacific Reef Heron
- Black Heron vs Western Reef Heron
- Black Heron vs Capped Heron
- Bare-throated Tiger Heron vs Fasciated Tiger Heron
- Fasciated Tiger Heron vs Rufescent Tiger Heron
- Capped Heron vs Fasciated Tiger Heron
- Pacific Reef Heron vs Pied Heron
- Pied Heron vs Western Reef Heron
- Black Heron vs Pied Heron
- Black Heron vs Chinese Egret
- Chinese Egret vs Pied Heron
- American Bittern vs Pinnated Bittern
- Eurasian Bittern vs Pinnated Bittern
- Agami Heron vs Pinnated Bittern
- Goliath Heron vs Great-billed Heron
- Agami Heron vs Great-billed Heron
Honeyeaters
- Little Wattlebird vs Red Wattlebird
- Noisy Friarbird vs Tui
- Blue-faced Honeyeater vs Tui
- Blue-faced Honeyeater vs Noisy Friarbird
- Singing Honeyeater vs Tui
- Blue-faced Honeyeater vs Singing Honeyeater
- Little Friarbird vs Noisy Friarbird
- Little Friarbird vs New Zealand Bellbird
- New Zealand Bellbird vs White-eared Honeyeater
- New Zealand Bellbird vs Spiny-cheeked Honeyeater
- Spiny-cheeked Honeyeater vs White-eared Honeyeater
- Little Friarbird vs Spiny-cheeked Honeyeater
- White-naped Honeyeater vs White-throated Honeyeater
- Brown-headed Honeyeater vs White-naped Honeyeater
- Brown-headed Honeyeater vs White-throated Honeyeater
- Noisy Miner vs Yellow-throated Miner
- Bell Miner vs Noisy Miner
- Bell Miner vs Yellow-throated Miner
- New Holland Honeyeater vs White-cheeked Honeyeater
- Striped Honeyeater vs White-fronted Chat
- Striped Honeyeater vs White-cheeked Honeyeater
- Helmeted Friarbird vs Noisy Friarbird
- Helmeted Friarbird vs Little Friarbird
- Helmeted Friarbird vs Striped Honeyeater
- Fuscous Honeyeater vs White-plumed Honeyeater
- Crescent Honeyeater vs New Holland Honeyeater
- Crescent Honeyeater vs White-cheeked Honeyeater
- Lewin's Honeyeater vs Yellow-spotted Honeyeater
- White-plumed Honeyeater vs Yellow-plumed Honeyeater
- Fuscous Honeyeater vs Yellow-plumed Honeyeater
- Black-chinned Honeyeater vs White-naped Honeyeater
- Black-chinned Honeyeater vs White-throated Honeyeater
- Black-chinned Honeyeater vs Brown-headed Honeyeater
- Red Wattlebird vs Yellow Wattlebird
- Little Wattlebird vs Yellow Wattlebird
- White-eared Honeyeater vs Yellow-throated Honeyeater
- Crimson Chat vs White-fronted Chat
- Black-chinned Honeyeater vs Black-headed Honeyeater
- Orange Chat vs White-fronted Chat
- Crimson Chat vs Orange Chat
- Red Wattlebird vs Regent Honeyeater
- Little Wattlebird vs Regent Honeyeater
- Regent Honeyeater vs Yellow Wattlebird
- Micronesian Myzomela vs Scarlet Myzomela
- Black Honeyeater vs Micronesian Myzomela
- Black Honeyeater vs Grey-fronted Honeyeater
- Grey-fronted Honeyeater vs Yellow-plumed Honeyeater
- Black-chinned Honeyeater vs Gilbert's Honeyeater
- Black-headed Honeyeater vs Gilbert's Honeyeater
- Black Honeyeater vs Gilbert's Honeyeater
- Eastern Spinebill vs Western Spinebill
- Pied Honeyeater vs Western Spinebill
- Painted Honeyeater vs Pied Honeyeater
- Purple-gaped Honeyeater vs Yellow-tufted Honeyeater
- Painted Honeyeater vs Purple-gaped Honeyeater
- Black-chinned Honeyeater vs Strong-billed Honeyeater
- Black-headed Honeyeater vs Strong-billed Honeyeater
- Gilbert's Honeyeater vs Strong-billed Honeyeater
Honeyguides
Hoopoes
Hornbills
- Indian Grey Hornbill vs Malabar Grey Hornbill
- African Grey Hornbill vs Crowned Hornbill
- Southern Red-billed Hornbill vs Southern Yellow-billed Hornbill
- Malabar Pied Hornbill vs Oriental Pied Hornbill
- Great Hornbill vs Rhinoceros Hornbill
- Southern Yellow-billed Hornbill vs Von der Decken's Hornbill
- Southern Red-billed Hornbill vs Von der Decken's Hornbill
- Black Hornbill vs Oriental Pied Hornbill
- Black Hornbill vs Malabar Pied Hornbill
- Southern Red-billed Hornbill vs Western Red-billed Hornbill
- Von der Decken's Hornbill vs Western Red-billed Hornbill
- Black-and-white-casqued Hornbill vs Silvery-cheeked Hornbill
- Blyth's Hornbill vs Wreathed Hornbill
- Indian Grey Hornbill vs Sri Lanka Grey Hornbill
- Malabar Grey Hornbill vs Sri Lanka Grey Hornbill
- Monteiro's Hornbill vs Von der Decken's Hornbill
- Monteiro's Hornbill vs Western Red-billed Hornbill
- Monteiro's Hornbill vs Rufous-necked Hornbill
- Abyssinian Ground Hornbill vs Southern Ground Hornbill
- Abyssinian Ground Hornbill vs Rufous-necked Hornbill
- Damara Red-billed Hornbill vs Von der Decken's Hornbill
- Damara Red-billed Hornbill vs Western Red-billed Hornbill
- Damara Red-billed Hornbill vs Monteiro's Hornbill
Hummingbirds
- Black-chinned Hummingbird vs Ruby-throated Hummingbird
- Allen's Hummingbird vs Rufous Hummingbird
- Broad-tailed Hummingbird vs Rufous Hummingbird
- Allen's Hummingbird vs Broad-tailed Hummingbird
- Anna's Hummingbird vs Costa's Hummingbird
- Cinnamon Hummingbird vs Rufous-tailed Hummingbird
- Calliope Hummingbird vs Rufous Hummingbird
- Allen's Hummingbird vs Calliope Hummingbird
- Broad-tailed Hummingbird vs Calliope Hummingbird
- Lesser Violetear vs Sparkling Violetear
- Buff-bellied Hummingbird vs Rufous-tailed Hummingbird
- Buff-bellied Hummingbird vs Cinnamon Hummingbird
- Green Hermit vs Long-billed Hermit
- Speckled Hummingbird vs Violet Sabrewing
- Gilded Sapphire vs Speckled Hummingbird
- Speckled Hummingbird vs White-eared Hummingbird
- Andean Emerald vs Green-crowned Brilliant
- Andean Emerald vs White-eared Hummingbird
- Andean Emerald vs Berylline Hummingbird
- Black-throated Mango vs Green-breasted Mango
- Crowned Woodnymph vs Violet-capped Woodnymph
- Scaly-breasted Hummingbird vs Violet-capped Woodnymph
- Scaly-breasted Hummingbird vs White-booted Racket-tail
- Berylline Hummingbird vs Steely-vented Hummingbird
- Scaly-breasted Hummingbird vs Steely-vented Hummingbird
- Azure-crowned Hummingbird vs Berylline Hummingbird
- Azure-crowned Hummingbird vs Steely-vented Hummingbird
- Crowned Woodnymph vs Fork-tailed Woodnymph
- Fork-tailed Woodnymph vs Violet-capped Woodnymph
- Fawn-breasted Brilliant vs Green-crowned Brilliant
- Fawn-breasted Brilliant vs Violet-headed Hummingbird
- Buff-tailed Coronet vs Violet-headed Hummingbird
- Broad-billed Hummingbird vs Canivet's Emerald
- Canivet's Emerald vs Violet-headed Hummingbird
- Long-tailed Sylph vs Violet-tailed Sylph
- Bronzy Inca vs Collared Inca
- Green Hermit vs Planalto Hermit
- Long-billed Hermit vs Planalto Hermit
- Glittering-bellied Emerald vs Western Emerald
- Berylline Hummingbird vs Blue-vented Hummingbird
- Blue-vented Hummingbird vs Steely-vented Hummingbird
- Azure-crowned Hummingbird vs Blue-vented Hummingbird
- Blue-vented Hummingbird vs Giant Hummingbird
- Planalto Hermit vs White-whiskered Hermit
- Giant Hummingbird vs White-whiskered Hermit
- Amazilia Hummingbird vs White-whiskered Hermit
- Amazilia Hummingbird vs Giant Hummingbird
- Amazilia Hummingbird vs Blue-vented Hummingbird
- Blue-throated Mountaingem vs Purple-throated Mountaingem
- Black Jacobin vs White-necked Jacobin
- Blue-vented Hummingbird vs Snowy-bellied Hummingbird
- Antillean Crested Hummingbird vs Shining Sunbeam
- Glittering-throated Emerald vs Sapphire-spangled Emerald
- Antillean Crested Hummingbird vs Sapphire-spangled Emerald
- Antillean Crested Hummingbird vs Versicolored Emerald
- Blue-vented Hummingbird vs Copper-rumped Hummingbird
- Copper-rumped Hummingbird vs Snowy-bellied Hummingbird
- Rivoli's Hummingbird vs Talamanca Hummingbird
- Blue-throated Sapphire vs White-bellied Emerald
- Planalto Hermit vs Tawny-bellied Hermit
- Tawny-bellied Hermit vs White-whiskered Hermit
- Tawny-bellied Hermit vs White-throated Hummingbird
- Calliope Hummingbird vs Volcano Hummingbird
- Volcano Hummingbird vs White-throated Hummingbird
- Brown Inca vs Collared Inca
- Bronzy Inca vs Brown Inca
- Brown Inca vs White-throated Hummingbird
- Buff-tailed Coronet vs Velvet-purple Coronet
- Planalto Hermit vs Reddish Hermit
- Reddish Hermit vs White-whiskered Hermit
- Reddish Hermit vs Tawny-bellied Hermit
- Empress Brilliant vs Green-crowned Brilliant
- Empress Brilliant vs Fawn-breasted Brilliant
- Blue-tailed Emerald vs Glittering-bellied Emerald
- Blue-tailed Emerald vs Western Emerald
- Bronze-tailed Plumeleteer vs White-vented Plumeleteer
- Golden-tailed Sapphire vs Versicolored Emerald
- Blue-throated Mountaingem vs White-throated Mountaingem
- Purple-throated Mountaingem vs White-throated Mountaingem
- Calliope Hummingbird vs Scintillant Hummingbird
- Scintillant Hummingbird vs Volcano Hummingbird
- Black-throated Mango vs Hispaniolan Mango
- Green-breasted Mango vs Hispaniolan Mango
- Purple-bibbed Whitetip vs Sword-billed Hummingbird
- Coppery-headed Emerald vs Sword-billed Hummingbird
- Buff-tailed Coronet vs Chestnut-breasted Coronet
- Chestnut-breasted Coronet vs Velvet-purple Coronet
- Chestnut-breasted Coronet vs Sword-billed Hummingbird
- Scale-throated Hermit vs Tawny-bellied Hermit
- Reddish Hermit vs Scale-throated Hermit
- Violet-bellied Hummingbird vs White-bellied Emerald
- Blue-throated Sapphire vs Violet-bellied Hummingbird
- Long-billed Starthroat vs Plain-capped Starthroat
- Lucifer Sheartail vs Mountain Velvetbreast
- Fiery-throated Hummingbird vs Mountain Velvetbreast
- Fiery-throated Hummingbird vs Lucifer Sheartail
- Mountain Velvetbreast vs White-bellied Hummingbird
- Fiery-throated Hummingbird vs White-bellied Hummingbird
- Red-tailed Comet vs White-bellied Hummingbird
- Fiery-throated Hummingbird vs Red-tailed Comet
- Mountain Velvetbreast vs Red-tailed Comet
- Garden Emerald vs Glittering-bellied Emerald
- Garden Emerald vs Western Emerald
- Blue-tailed Emerald vs Garden Emerald
- Black-tailed Trainbearer vs Green-tailed Trainbearer
- Green-tailed Trainbearer vs Ruby-topaz Hummingbird
- Green-crowned Brilliant vs Violet-fronted Brilliant
- Fawn-breasted Brilliant vs Violet-fronted Brilliant
- Empress Brilliant vs Violet-fronted Brilliant
- Ruby-topaz Hummingbird vs Violet-fronted Brilliant
- Mexican Violetear vs Sparkling Violetear
- Lesser Violetear vs Mexican Violetear
- Mexican Violetear vs Ruby-topaz Hummingbird
- Great Sapphirewing vs Mexican Violetear
- Great Sapphirewing vs Violet-fronted Brilliant
- Buff-winged Starfrontlet vs Collared Inca
- Bronzy Inca vs Buff-winged Starfrontlet
- Brown Inca vs Buff-winged Starfrontlet
- Buff-winged Starfrontlet vs Great Sapphirewing
- Grey-breasted Sabrewing vs Violet Sabrewing
- Grey-breasted Sabrewing vs Oasis Hummingbird
- Band-tailed Barbthroat vs Oasis Hummingbird
- Red-billed Emerald vs Western Emerald
- Blue-tailed Emerald vs Red-billed Emerald
- Garden Emerald vs Red-billed Emerald
- Oasis Hummingbird vs Red-billed Emerald
- Sombre Hummingbird vs Swallow-tailed Hummingbird
- Pale-bellied Hermit vs Scale-throated Hermit
- Sapphire-throated Hummingbird vs Versicolored Emerald
- Golden-tailed Sapphire vs Sapphire-throated Hummingbird
- Coppery-headed Emerald vs Snowcap
- Blue-tufted Starthroat vs Long-billed Starthroat
- Blue-tufted Starthroat vs Plain-capped Starthroat
- Blue-tufted Starthroat vs Saw-billed Hermit
- White-bellied Emerald vs White-chinned Sapphire
- Blue-throated Sapphire vs White-chinned Sapphire
- Violet-bellied Hummingbird vs White-chinned Sapphire
- Saw-billed Hermit vs White-chinned Sapphire
- Blue-throated Mountaingem vs Green-throated Mountaingem
- Green-throated Mountaingem vs Purple-throated Mountaingem
- Green-throated Mountaingem vs White-throated Mountaingem
- Green-throated Mountaingem vs Saw-billed Hermit
- Brazilian Ruby vs Empress Brilliant
- Brazilian Ruby vs Violet-fronted Brilliant
- Indigo-capped Hummingbird vs Snowy-bellied Hummingbird
- Copper-rumped Hummingbird vs Indigo-capped Hummingbird
- Magenta-throated Woodstar vs Purple-throated Woodstar
- Bronzy Hermit vs Rufous-breasted Hermit
- Pale-bellied Hermit vs White-bearded Hermit
- Dusky Hummingbird vs White-bearded Hermit
- Blue-chinned Sapphire vs Blue-throated Sapphire
- Blue-chinned Sapphire vs Violet-bellied Hummingbird
- Blue-chinned Sapphire vs White-chinned Sapphire
- Blue-chinned Sapphire vs Dusky Hummingbird
- Black-eared Fairy vs Purple-crowned Fairy
- Black-eared Fairy vs Dusky Hummingbird
- Peruvian Racket-tail vs White-booted Racket-tail
- Mexican Violetear vs White-vented Violetear
- Lesser Violetear vs White-vented Violetear
- Shining-green Hummingbird vs Versicolored Emerald
- Golden-tailed Sapphire vs Shining-green Hummingbird
- Sapphire-throated Hummingbird vs Shining-green Hummingbird
- Tyrian Metaltail vs Viridian Metaltail
- Great-billed Hermit vs Pale-bellied Hermit
- Great-billed Hermit vs White-bearded Hermit
- Gorgeted Woodstar vs White-bellied Woodstar
- Gorgeted Woodstar vs Many-spotted Hummingbird
- Amethyst Woodstar vs Many-spotted Hummingbird
- Cuban Emerald vs Puerto Rican Emerald
- Many-spotted Hummingbird vs Puerto Rican Emerald
- Amethyst Woodstar vs Puerto Rican Emerald
- Grey-chinned Hermit vs Pale-bellied Hermit
- Grey-chinned Hermit vs White-bearded Hermit
- Great-billed Hermit vs Grey-chinned Hermit
- Amethyst Woodstar vs Grey-chinned Hermit
- Green Thorntail vs Wire-crested Thorntail
- Amethyst-throated Mountaingem vs White-throated Mountaingem
- Amethyst-throated Mountaingem vs Green-throated Mountaingem
- Rufous Sabrewing vs Wedge-tailed Sabrewing
- Amethyst-throated Sunangel vs Tourmaline Sunangel
- Sapphire-throated Hummingbird vs White-chested Emerald
- Shining-green Hummingbird vs White-chested Emerald
- Black-bellied Hummingbird vs Stripe-tailed Hummingbird
- Longuemare's Sunangel vs Tourmaline Sunangel
- Amethyst-throated Sunangel vs Longuemare's Sunangel
- Empress Brilliant vs Gould's Jewelfront
- Gould's Jewelfront vs Violet-fronted Brilliant
- Brazilian Ruby vs Gould's Jewelfront
- Green-throated Carib vs Purple-throated Carib
- Black-throated Mango vs Green Mango
- Green-breasted Mango vs Green Mango
- Green Mango vs Hispaniolan Mango
- Glowing Puffleg vs Golden-breasted Puffleg
- Purple-backed Thornbill vs Purple-collared Woodstar
- Golden-breasted Puffleg vs Purple-collared Woodstar
- Green Mango vs Purple-collared Woodstar
- Buffy Hummingbird vs Rainbow-bearded Thornbill
- Green-backed Hillstar vs Rufous-gaped Hillstar
- Buffy Hummingbird vs Green-backed Hillstar
- Glowing Puffleg vs Sapphire-vented Puffleg
- Golden-breasted Puffleg vs Sapphire-vented Puffleg
- Buffy Hummingbird vs Sapphire-vented Puffleg
- Great-billed Hermit vs Sooty-capped Hermit
- Grey-chinned Hermit vs Sooty-capped Hermit
- Black-crested Coquette vs Rufous-crested Coquette
- Green-throated Mountaingem vs White-bellied Mountaingem
- Amethyst-throated Mountaingem vs White-bellied Mountaingem
- Gorgeted Sunangel vs Tourmaline Sunangel
- Amethyst-throated Sunangel vs Gorgeted Sunangel
- Gorgeted Sunangel vs Longuemare's Sunangel
- Gorgeted Sunangel vs Peruvian Sheartail
- Mexican Sheartail vs Peruvian Sheartail
- White-eared Hummingbird vs Xantus's Hummingbird
- Peruvian Sheartail vs Xantus's Hummingbird
- Coppery-headed Emerald vs White-tailed Emerald
- Snowcap vs White-tailed Emerald
- Black-crested Coquette vs Tufted Coquette
- Rufous-crested Coquette vs Tufted Coquette
- Brown Inca vs Violet-throated Starfrontlet
- Buff-winged Starfrontlet vs Violet-throated Starfrontlet
- Long-tailed Hermit vs Sooty-capped Hermit
- Green-and-white Hummingbird vs White-bellied Hummingbird
- Blue-fronted Lancebill vs Green-fronted Lancebill
- Bumblebee Hummingbird vs Calliope Hummingbird
- Bumblebee Hummingbird vs Volcano Hummingbird
- Bumblebee Hummingbird vs Scintillant Hummingbird
- Blue-tailed Hummingbird vs Indigo-capped Hummingbird
- Black-crested Coquette vs Festive Coquette
- Festive Coquette vs Rufous-crested Coquette
- Festive Coquette vs Tufted Coquette
- Black-throated Brilliant vs Brazilian Ruby
- Black-throated Brilliant vs Gould's Jewelfront
- Lazuline Sabrewing vs Violet Sabrewing
- Grey-breasted Sabrewing vs Lazuline Sabrewing
- Emerald-chinned Hummingbird vs White-tailed Goldenthroat
- Sooty-capped Hermit vs Straight-billed Hermit
- Long-tailed Hermit vs Straight-billed Hermit
- Emerald-chinned Hummingbird vs Straight-billed Hermit
- Broad-billed Hummingbird vs Golden-crowned Emerald
- Canivet's Emerald vs Golden-crowned Emerald
- Emerald-chinned Hummingbird vs Golden-crowned Emerald
- Rufous-booted Racket-tail vs White-booted Racket-tail
- Peruvian Racket-tail vs Rufous-booted Racket-tail
- Garnet-throated Hummingbird vs Rufous-booted Racket-tail
- Hispaniolan Mango vs Jamaican Mango
- Green Mango vs Jamaican Mango
- Garnet-throated Hummingbird vs Jamaican Mango
- Broad-billed Hummingbird vs Cozumel Emerald
- Canivet's Emerald vs Cozumel Emerald
- Cozumel Emerald vs Golden-crowned Emerald
- Cozumel Emerald vs Garnet-throated Hummingbird
- Buff-winged Starfrontlet vs White-tailed Starfrontlet
- Violet-throated Starfrontlet vs White-tailed Starfrontlet
- Canivet's Emerald vs Turquoise-crowned Hummingbird
- Golden-crowned Emerald vs Turquoise-crowned Hummingbird
- Cozumel Emerald vs Turquoise-crowned Hummingbird
- Andean Hillstar vs White-sided Hillstar
- Rufous-crested Coquette vs White-crested Coquette
- Tufted Coquette vs White-crested Coquette
- Festive Coquette vs White-crested Coquette
- Blue-throated Starfrontlet vs Violet-throated Starfrontlet
- Blue-throated Starfrontlet vs White-tailed Starfrontlet
- Blue-throated Starfrontlet vs Tooth-billed Hummingbird
- Sparkling-tailed Woodstar vs Tooth-billed Hummingbird
- Blue-throated Starfrontlet vs Sparkling-tailed Woodstar
- Long-billed Starthroat vs Stripe-breasted Starthroat
- Plain-capped Starthroat vs Stripe-breasted Starthroat
- Blue-tufted Starthroat vs Stripe-breasted Starthroat
- Stripe-breasted Starthroat vs Tooth-billed Hummingbird
- Sparkling-tailed Woodstar vs Stripe-breasted Starthroat
- Black-thighed Puffleg vs Glowing Puffleg
- Black-thighed Puffleg vs Golden-breasted Puffleg
- Black-thighed Puffleg vs Sapphire-vented Puffleg
- Blue-mantled Thornbill vs Rainbow-bearded Thornbill
- Cuban Emerald vs Hispaniolan Emerald
- Hispaniolan Emerald vs Puerto Rican Emerald
- Black Metaltail vs Tyrian Metaltail
- Black Metaltail vs Viridian Metaltail
- Plain-bellied Emerald vs Shining-green Hummingbird
- Plain-bellied Emerald vs White-chested Emerald
- Green-bellied Hummingbird vs Indigo-capped Hummingbird
- Blue-tailed Hummingbird vs Green-bellied Hummingbird
- Band-tailed Barbthroat vs Pale-tailed Barbthroat
- Pale-tailed Barbthroat vs Short-tailed Woodstar
- Garden Emerald vs Short-tailed Emerald
- Red-billed Emerald vs Short-tailed Emerald
- Short-tailed Emerald vs Short-tailed Woodstar
- Rainbow Starfrontlet vs Violet-throated Starfrontlet
- Rainbow Starfrontlet vs White-tailed Starfrontlet
- Blue-throated Starfrontlet vs Rainbow Starfrontlet
- Gilded Sapphire vs Rufous-throated Sapphire
- Napo Sabrewing vs Violet Sabrewing
- Grey-breasted Sabrewing vs Napo Sabrewing
- Lazuline Sabrewing vs Napo Sabrewing
- Frilled Coquette vs White-crested Coquette
- Festive Coquette vs Frilled Coquette
- Bearded Mountaineer vs Frilled Coquette
- Green-tailed Goldenthroat vs White-tailed Goldenthroat
- Bearded Mountaineer vs Green-tailed Goldenthroat
- Green-crowned Plovercrest vs Purple-crowned Plovercrest
- Bearded Mountaineer vs Green-crowned Plovercrest
Ibises and Spoonbills
- Glossy Ibis vs White-faced Ibis
- Eurasian Spoonbill vs Roseate Spoonbill
- African Sacred Ibis vs Australian White Ibis
- Australian White Ibis vs Straw-necked Ibis
- African Sacred Ibis vs Straw-necked Ibis
- Australian White Ibis vs Black-headed Ibis
- African Sacred Ibis vs Black-headed Ibis
- Black-headed Ibis vs Straw-necked Ibis
- Bare-faced Ibis vs Black-headed Ibis
- Bare-faced Ibis vs Straw-necked Ibis
- Roseate Spoonbill vs Royal Spoonbill
- Eurasian Spoonbill vs Royal Spoonbill
- Bare-faced Ibis vs Royal Spoonbill
- Buff-necked Ibis vs Green Ibis
- Black-faced Ibis vs Buff-necked Ibis
- Black-faced Ibis vs Green Ibis
- Royal Spoonbill vs Yellow-billed Spoonbill
- Glossy Ibis vs Puna Ibis
- Puna Ibis vs White-faced Ibis
- Buff-necked Ibis vs Plumbeous Ibis
- Black-faced Ibis vs Plumbeous Ibis
- American White Ibis vs Scarlet Ibis
- Northern Bald Ibis vs Southern Bald Ibis
- Northern Bald Ibis vs Sharp-tailed Ibis
- Hadada Ibis vs Wattled Ibis
- Sharp-tailed Ibis vs Wattled Ibis
Ioras
Jacamars
- Bluish-fronted Jacamar vs Rufous-tailed Jacamar
- Paradise Jacamar vs Rufous-tailed Jacamar
- Bluish-fronted Jacamar vs Paradise Jacamar
- Great Jacamar vs White-eared Jacamar
- Great Jacamar vs Paradise Jacamar
- Brown Jacamar vs Great Jacamar
- Rufous-tailed Jacamar vs White-chinned Jacamar
- Bluish-fronted Jacamar vs White-chinned Jacamar
- Paradise Jacamar vs White-chinned Jacamar
- Bluish-fronted Jacamar vs Green-tailed Jacamar
- Green-tailed Jacamar vs Paradise Jacamar
- Green-tailed Jacamar vs White-chinned Jacamar
- Bronzy Jacamar vs White-chinned Jacamar
- Bronzy Jacamar vs Green-tailed Jacamar
- Coppery-chested Jacamar vs White-chinned Jacamar
- Coppery-chested Jacamar vs Green-tailed Jacamar
- Bronzy Jacamar vs Coppery-chested Jacamar
- Green-tailed Jacamar vs Yellow-billed Jacamar
- Bronzy Jacamar vs Yellow-billed Jacamar
- Coppery-chested Jacamar vs Yellow-billed Jacamar
Jacanas
- Northern Jacana vs Wattled Jacana
- Bronze-winged Jacana vs Northern Jacana
- African Jacana vs Bronze-winged Jacana
- Bronze-winged Jacana vs Pheasant-tailed Jacana
- African Jacana vs Pheasant-tailed Jacana
- Comb-crested Jacana vs Pheasant-tailed Jacana
- African Jacana vs Comb-crested Jacana
- Comb-crested Jacana vs Lesser Jacana
- Lesser Jacana vs Pheasant-tailed Jacana
Jaegers and Skuas
- Parasitic Jaeger vs Pomarine Jaeger
- Long-tailed Jaeger vs Parasitic Jaeger
- Long-tailed Jaeger vs Pomarine Jaeger
- Great Skua vs Parasitic Jaeger
- Great Skua vs Pomarine Jaeger
- Great Skua vs Long-tailed Jaeger
- Chilean Skua vs Pomarine Jaeger
- Chilean Skua vs Long-tailed Jaeger
- Chilean Skua vs Great Skua
- Chilean Skua vs South Polar Skua
- Great Skua vs South Polar Skua
- Brown Skua vs Chilean Skua
- Brown Skua vs South Polar Skua
- Brown Skua vs Great Skua
Jewel-babblers and Quail-thrushes
Kingfishers
- Belted Kingfisher vs Ringed Kingfisher
- Pied Kingfisher vs Ringed Kingfisher
- Pied Kingfisher vs Sacred Kingfisher
- Green Kingfisher vs Pied Kingfisher
- Amazon Kingfisher vs Green Kingfisher
- Brown-hooded Kingfisher vs White-throated Kingfisher
- Collared Kingfisher vs Sacred Kingfisher
- White-throated Kingfisher vs Woodland Kingfisher
- Brown-hooded Kingfisher vs Woodland Kingfisher
- Belted Kingfisher vs Giant Kingfisher
- Giant Kingfisher vs Ringed Kingfisher
- Forest Kingfisher vs Sacred Kingfisher
- Collared Kingfisher vs Forest Kingfisher
- Blue-winged Kookaburra vs Laughing Kookaburra
- American Pygmy Kingfisher vs Green Kingfisher
- Amazon Kingfisher vs American Pygmy Kingfisher
- Striped Kingfisher vs White-throated Kingfisher
- Brown-hooded Kingfisher vs Striped Kingfisher
- Striped Kingfisher vs Woodland Kingfisher
- Brown-hooded Kingfisher vs Grey-headed Kingfisher
- Grey-headed Kingfisher vs Woodland Kingfisher
- Grey-headed Kingfisher vs Striped Kingfisher
- Black-capped Kingfisher vs Woodland Kingfisher
- Black-capped Kingfisher vs Striped Kingfisher
- Black-capped Kingfisher vs Grey-headed Kingfisher
- Red-backed Kingfisher vs Sacred Kingfisher
- Collared Kingfisher vs Red-backed Kingfisher
- Forest Kingfisher vs Red-backed Kingfisher
- Blue-eared Kingfisher vs Common Kingfisher
- Green-and-rufous Kingfisher vs Green Kingfisher
- Amazon Kingfisher vs Green-and-rufous Kingfisher
- American Pygmy Kingfisher vs Green-and-rufous Kingfisher
- Belted Kingfisher vs Crested Kingfisher
- Crested Kingfisher vs Ringed Kingfisher
- Crested Kingfisher vs Giant Kingfisher
- Azure Kingfisher vs Black-backed Dwarf Kingfisher
- Common Kingfisher vs Half-collared Kingfisher
- Blue-eared Kingfisher vs Half-collared Kingfisher
- Banded Kingfisher vs Half-collared Kingfisher
- Black-capped Kingfisher vs Ruddy Kingfisher
- Banded Kingfisher vs Ruddy Kingfisher
- Banded Kingfisher vs Buff-breasted Paradise Kingfisher
- Pacific Kingfisher vs Red-backed Kingfisher
- Azure Kingfisher vs Little Kingfisher
- Black-backed Dwarf Kingfisher vs Little Kingfisher
- Cerulean Kingfisher vs Common Kingfisher
- Blue-eared Kingfisher vs Cerulean Kingfisher
- Cerulean Kingfisher vs Half-collared Kingfisher
Kinglets
- Golden-crowned Kinglet vs Ruby-crowned Kinglet
- Goldcrest vs Ruby-crowned Kinglet
- Goldcrest vs Golden-crowned Kinglet
- Common Firecrest vs Ruby-crowned Kinglet
- Common Firecrest vs Golden-crowned Kinglet
- Common Firecrest vs Goldcrest
- Flamecrest vs Golden-crowned Kinglet
- Flamecrest vs Goldcrest
- Common Firecrest vs Flamecrest
Kites, Old World Vultures, Eagles, and Hawks
- Red-shouldered Hawk vs Red-tailed Hawk
- Common Buzzard vs Red-tailed Hawk
- Common Buzzard vs Red-shouldered Hawk
- Hen Harrier vs Western Marsh Harrier
- Eurasian Sparrowhawk vs Sharp-shinned Hawk
- Black Kite vs Red Kite
- Bald Eagle vs White-tailed Eagle
- Broad-winged Hawk vs Red-tailed Hawk
- Broad-winged Hawk vs Red-shouldered Hawk
- Broad-winged Hawk vs Common Buzzard
- Red-shouldered Hawk vs Rough-legged Buzzard
- Common Buzzard vs Rough-legged Buzzard
- Broad-winged Hawk vs Rough-legged Buzzard
- Roadside Hawk vs Rough-legged Buzzard
- Broad-winged Hawk vs Roadside Hawk
- Broad-winged Hawk vs Swainson's Hawk
- Rough-legged Buzzard vs Swainson's Hawk
- Roadside Hawk vs Swainson's Hawk
- Black-winged Kite vs White-tailed Kite
- Booted Eagle vs Swallow-tailed Kite
- Short-toed Snake Eagle vs Swallow-tailed Kite
- Broad-winged Hawk vs Grey-lined Hawk
- Grey-lined Hawk vs Rough-legged Buzzard
- Grey-lined Hawk vs Swainson's Hawk
- Grey-lined Hawk vs Swallow-tailed Kite
- Hen Harrier vs Montagu's Harrier
- Montagu's Harrier vs Western Marsh Harrier
- Brahminy Kite vs Whistling Kite
- Cinereous Vulture vs White-bellied Sea Eagle
- Hen Harrier vs Swamp Harrier
- Swamp Harrier vs Western Marsh Harrier
- Montagu's Harrier vs Swamp Harrier
- Cinereous Vulture vs Swamp Harrier
- Crested Honey Buzzard vs European Honey Buzzard
- Cinereous Vulture vs Crested Honey Buzzard
- African Fish Eagle vs White-bellied Sea Eagle
- African Fish Eagle vs Snail Kite
- Golden Eagle vs Wedge-tailed Eagle
- Snail Kite vs Wedge-tailed Eagle
- Ferruginous Hawk vs Grey-lined Hawk
- Ferruginous Hawk vs Snail Kite
- Black-shouldered Kite vs Black-winged Kite
- Black-shouldered Kite vs White-tailed Kite
- Black-shouldered Kite vs Egyptian Vulture
- Egyptian Vulture vs White-tailed Hawk
- Grey-lined Hawk vs Zone-tailed Hawk
- Ferruginous Hawk vs Zone-tailed Hawk
- Egyptian Vulture vs Zone-tailed Hawk
- Griffon Vulture vs White-backed Vulture
- Common Black Hawk vs Savanna Hawk
- Ferruginous Hawk vs Jackal Buzzard
- Jackal Buzzard vs Zone-tailed Hawk
- Variable Hawk vs White-tailed Hawk
- Bateleur vs Variable Hawk
- Bateleur vs Jackal Buzzard
- Long-legged Buzzard vs Zone-tailed Hawk
- Jackal Buzzard vs Long-legged Buzzard
- Bateleur vs Long-legged Buzzard
- Montagu's Harrier vs Pallid Harrier
- Pallid Harrier vs Swamp Harrier
- Black-chested Buzzard-Eagle vs White-tailed Hawk
- Black-chested Buzzard-Eagle vs Variable Hawk
- Bonelli's Eagle vs Golden Eagle
- Bonelli's Eagle vs Wedge-tailed Eagle
- Common Black Hawk vs Great Black Hawk
- Great Black Hawk vs Savanna Hawk
- Golden Eagle vs Tawny Eagle
- Tawny Eagle vs Wedge-tailed Eagle
- Bonelli's Eagle vs Tawny Eagle
- Steppe Eagle vs Wedge-tailed Eagle
- Bonelli's Eagle vs Steppe Eagle
- Steppe Eagle vs Tawny Eagle
- Greater Spotted Eagle vs Lesser Spotted Eagle
- Black Eagle vs Long-crested Eagle
- Bearded Vulture vs Long-crested Eagle
- Bearded Vulture vs Black Eagle
- Black Eagle vs Black Hawk-Eagle
- Bearded Vulture vs Black Hawk-Eagle
- Hooded Vulture vs White Hawk
- Hooded Vulture vs Hook-billed Kite
- Hook-billed Kite vs White Hawk
- Booted Eagle vs Wahlberg's Eagle
- Hook-billed Kite vs Wahlberg's Eagle
- Brown Snake Eagle vs Short-toed Snake Eagle
- Brown Snake Eagle vs Hook-billed Kite
- Double-toothed Kite vs Gabar Goshawk
- Booted Eagle vs Little Eagle
- Little Eagle vs Wahlberg's Eagle
- Gabar Goshawk vs Little Eagle
- Gabar Goshawk vs Martial Eagle
- Little Eagle vs Martial Eagle
- Griffon Vulture vs Himalayan Vulture
- Himalayan Vulture vs White-backed Vulture
- Black-chested Snake Eagle vs Short-toed Snake Eagle
- Black-chested Snake Eagle vs Brown Snake Eagle
- Eastern Marsh Harrier vs Montagu's Harrier
- Eastern Marsh Harrier vs Swamp Harrier
- Eastern Marsh Harrier vs Pallid Harrier
- Eastern Marsh Harrier vs Lizard Buzzard
- Long-winged Harrier vs Pallid Harrier
- Lizard Buzzard vs Long-winged Harrier
- Eastern Marsh Harrier vs Long-winged Harrier
- Grey-headed Kite vs Lizard Buzzard
- Bonelli's Eagle vs Eastern Imperial Eagle
- Eastern Imperial Eagle vs Tawny Eagle
- Eastern Imperial Eagle vs Steppe Eagle
- Cinereous Harrier vs Pallid Harrier
- Cinereous Harrier vs Eastern Marsh Harrier
- Cinereous Harrier vs Long-winged Harrier
- African Marsh Harrier vs Eastern Marsh Harrier
- African Marsh Harrier vs Long-winged Harrier
- African Marsh Harrier vs Cinereous Harrier
- Grey-faced Buzzard vs White-eyed Buzzard
- Eastern Imperial Eagle vs Verreaux's Eagle
- Cape Vulture vs Griffon Vulture
- Cape Vulture vs White-backed Vulture
- Cape Vulture vs Himalayan Vulture
- Black Hawk-Eagle vs Ornate Hawk-Eagle
- Pacific Baza vs Palm-nut Vulture
- Ornate Hawk-Eagle vs Palm-nut Vulture
- Eastern Imperial Eagle vs Spanish Imperial Eagle
- Spanish Imperial Eagle vs Verreaux's Eagle
- Palm-nut Vulture vs Spanish Imperial Eagle
- African Marsh Harrier vs Spotted Harrier
- Cinereous Harrier vs Spotted Harrier
- Long-winged Harrier vs Spotted Harrier
- African Hawk-Eagle vs Eastern Imperial Eagle
- African Hawk-Eagle vs Verreaux's Eagle
- African Hawk-Eagle vs Spanish Imperial Eagle
- African Hawk-Eagle vs Pearl Kite
- Pearl Kite vs Spotted Harrier
- Pearl Kite vs Spanish Imperial Eagle
- Lappet-faced Vulture vs Pearl Kite
- African Hawk-Eagle vs Lappet-faced Vulture
- Lappet-faced Vulture vs Spotted Harrier
- Dark Chanting Goshawk vs Pale Chanting Goshawk
- Grey-headed Fish Eagle vs White-bellied Sea Eagle
- African Fish Eagle vs Grey-headed Fish Eagle
- Crowned Eagle vs Grey-headed Fish Eagle
- Crowned Eagle vs Dark Chanting Goshawk
- Black Baza vs Pacific Baza
- Black Baza vs Crowned Eagle
- Barred Hawk vs Black Baza
- Changeable Hawk-Eagle vs Mountain Hawk-Eagle
- Barred Hawk vs Mountain Hawk-Eagle
- Barred Hawk vs Square-tailed Kite
- Mountain Hawk-Eagle vs Square-tailed Kite
- Pied Harrier vs Square-tailed Kite
- Pied Harrier vs Spotted Harrier
- Square-tailed Kite vs White-headed Vulture
- Pied Harrier vs White-headed Vulture
- Rüppell's Vulture vs White-backed Vulture
- Himalayan Vulture vs Rüppell's Vulture
- Cape Vulture vs Rüppell's Vulture
- Rüppell's Vulture vs White-headed Vulture
- Greater Spotted Eagle vs Indian Spotted Eagle
- Indian Spotted Eagle vs Lesser Spotted Eagle
- Himalayan Vulture vs White-rumped Vulture
- Cape Vulture vs White-rumped Vulture
- Rüppell's Vulture vs White-rumped Vulture
- Augur Buzzard vs Upland Buzzard
- Indian Vulture vs Rüppell's Vulture
- Indian Vulture vs White-rumped Vulture
- Indian Vulture vs Rufous-bellied Eagle
- Eastern Chanting Goshawk vs Pale Chanting Goshawk
- Dark Chanting Goshawk vs Eastern Chanting Goshawk
- Eastern Chanting Goshawk vs Rufous-bellied Eagle
- Common Black Hawk vs Slate-colored Hawk
- Savanna Hawk vs Slate-colored Hawk
- Great Black Hawk vs Slate-colored Hawk
- Rufous-bellied Eagle vs Slate-colored Hawk
- Black-and-white Hawk-Eagle vs Black Hawk-Eagle
- Black-and-white Hawk-Eagle vs Ornate Hawk-Eagle
- Black-and-white Hawk-Eagle vs Red-headed Vulture
- Red-headed Vulture vs Slate-colored Hawk
- Black-breasted Buzzard vs Red-headed Vulture
- Hawaiian Hawk vs Upland Buzzard
- Black-breasted Buzzard vs Hawaiian Hawk
- Forest Buzzard vs Upland Buzzard
- Black-breasted Buzzard vs Forest Buzzard
- Forest Buzzard vs Hawaiian Hawk
- Lesser Fish Eagle vs White-bellied Sea Eagle
- African Fish Eagle vs Lesser Fish Eagle
- Grey-headed Fish Eagle vs Lesser Fish Eagle
- Harris's Hawk vs White-rumped Hawk
- Eurasian Sparrowhawk vs Ovambo Sparrowhawk
- Ovambo Sparrowhawk vs Sharp-shinned Hawk
- Galapagos Hawk vs Hawaiian Hawk
- Forest Buzzard vs Galapagos Hawk
- Bald Eagle vs Steller's Sea Eagle
- Steller's Sea Eagle vs White-tailed Eagle
- Short-toed Snake Eagle vs Western Banded Snake Eagle
- Brown Snake Eagle vs Western Banded Snake Eagle
- Black-chested Snake Eagle vs Western Banded Snake Eagle
- Cuban Black Hawk vs Great Black Hawk
- Cuban Black Hawk vs Slate-colored Hawk
- Bald Eagle vs Pallas's Fish Eagle
- Pallas's Fish Eagle vs White-tailed Eagle
- Pallas's Fish Eagle vs Steller's Sea Eagle
- Jerdon's Baza vs Pacific Baza
- Black Baza vs Jerdon's Baza
- Pied Harrier vs Reunion Harrier
- African Cuckoo-Hawk vs Pacific Baza
- African Cuckoo-Hawk vs Black Baza
- African Cuckoo-Hawk vs Jerdon's Baza
- Bat Hawk vs Slender-billed Kite
- Eurasian Sparrowhawk vs Rufous-breasted Sparrowhawk
- Rufous-breasted Sparrowhawk vs Sharp-shinned Hawk
- Ovambo Sparrowhawk vs Rufous-breasted Sparrowhawk
- Harpy Eagle vs Tiny Hawk
- Harpy Eagle vs Rufous-breasted Sparrowhawk
- Forest Buzzard vs White-throated Hawk
- Galapagos Hawk vs White-throated Hawk
- Harpy Eagle vs White-throated Hawk
- Madagascar Buzzard vs White-throated Hawk
- Grasshopper Buzzard vs White-eyed Buzzard
- Grasshopper Buzzard vs Grey-faced Buzzard
- Mountain Buzzard vs White-throated Hawk
- Madagascar Buzzard vs Mountain Buzzard
- Black-and-chestnut Eagle vs Black Hawk-Eagle
- Black-and-chestnut Eagle vs Ornate Hawk-Eagle
- Black-and-chestnut Eagle vs Black-and-white Hawk-Eagle
- Red-necked Buzzard vs White-throated Hawk
- Madagascar Buzzard vs Red-necked Buzzard
- Mountain Buzzard vs Red-necked Buzzard
Larks
- Crested Lark vs Woodlark
- Crested Lark vs Thekla's Lark
- Thekla's Lark vs Woodlark
- Eurasian Skylark vs Oriental Skylark
- Oriental Skylark vs Woodlark
- Greater Short-toed Lark vs Red-capped Lark
- Crested Lark vs Large-billed Lark
- Large-billed Lark vs Thekla's Lark
- Desert Lark vs Rufous-tailed Lark
- Crested Lark vs Malabar Lark
- Malabar Lark vs Thekla's Lark
- Large-billed Lark vs Malabar Lark
- Black-crowned Sparrow-Lark vs Chestnut-backed Sparrow-Lark
- Bar-tailed Lark vs Rufous-tailed Lark
- Bar-tailed Lark vs Desert Lark
- Bimaculated Lark vs Calandra Lark
- Monotonous Lark vs Singing Bush Lark
- Horned Lark vs Temminck's Lark
- Pink-billed Lark vs Stark's Lark
Laughingthrushes and Allies
- Jungle Babbler vs Yellow-billed Babbler
- Jungle Babbler vs Large Grey Babbler
- Large Grey Babbler vs Yellow-billed Babbler
- Common Babbler vs Jungle Babbler
- Common Babbler vs Yellow-billed Babbler
- Common Babbler vs Large Grey Babbler
- Chinese Hwamei vs White-crested Laughingthrush
- Large Grey Babbler vs Rufous Babbler
- Common Babbler vs Rufous Babbler
- Arabian Babbler vs Large Grey Babbler
- Arabian Babbler vs Common Babbler
- Arabian Babbler vs Rufous Babbler
- Arrow-marked Babbler vs Southern Pied Babbler
- Arrow-marked Babbler vs Brown Babbler
- Brown Babbler vs Southern Pied Babbler
- Variegated Laughingthrush vs White-whiskered Laughingthrush
- Chestnut-hooded Laughingthrush vs Rufous-necked Laughingthrush
- Plain Laughingthrush vs Rufous-necked Laughingthrush
Leaf Warblers
- Common Chiffchaff vs Willow Warbler
- Common Chiffchaff vs Wood Warbler
- Willow Warbler vs Wood Warbler
- Common Chiffchaff vs Yellow-browed Warbler
- Willow Warbler vs Yellow-browed Warbler
- Wood Warbler vs Yellow-browed Warbler
- Western Bonelli's Warbler vs Wood Warbler
- Western Bonelli's Warbler vs Yellow-browed Warbler
- Iberian Chiffchaff vs Pallas's Leaf Warbler
- Eastern Crowned Warbler vs Lemon-rumped Warbler
- Pale-legged Leaf Warbler vs Radde's Warbler
- Radde's Warbler vs Western Crowned Warbler
Leafbirds
Logrunner and Chowchilla
Longspurs and Snow Buntings
Loons
- Common Loon vs Red-throated Loon
- Black-throated Loon vs Common Loon
- Black-throated Loon vs Red-throated Loon
- Common Loon vs Pacific Loon
- Pacific Loon vs Red-throated Loon
- Black-throated Loon vs Pacific Loon
- Red-throated Loon vs Yellow-billed Loon
- Black-throated Loon vs Yellow-billed Loon
- Pacific Loon vs Yellow-billed Loon
Lyrebirds
Manakins
- White-bearded Manakin vs White-collared Manakin
- Blue Manakin vs Long-tailed Manakin
- Golden-collared Manakin vs White-collared Manakin
- Golden-collared Manakin vs White-bearded Manakin
- Golden-headed Manakin vs Red-capped Manakin
- Blue Manakin vs Lance-tailed Manakin
- Lance-tailed Manakin vs Long-tailed Manakin
- Orange-collared Manakin vs White-collared Manakin
- Orange-collared Manakin vs White-bearded Manakin
- Golden-collared Manakin vs Orange-collared Manakin
- Dwarf Tyrant-Manakin vs White-crowned Manakin
- Orange-collared Manakin vs White-crowned Manakin
- Golden-winged Manakin vs White-crowned Manakin
- Golden-winged Manakin vs Striolated Manakin
- Golden-winged Manakin vs Pin-tailed Manakin
- Pin-tailed Manakin vs Striolated Manakin
- Band-tailed Manakin vs Pin-tailed Manakin
- Club-winged Manakin vs Striolated Manakin
- Blue-backed Manakin vs Blue Manakin
- Blue-backed Manakin vs Long-tailed Manakin
- Blue-backed Manakin vs Lance-tailed Manakin
- Red-capped Manakin vs Red-headed Manakin
- Golden-headed Manakin vs Red-headed Manakin
- Fiery-capped Manakin vs Striolated Manakin
- Club-winged Manakin vs Fiery-capped Manakin
- Band-tailed Manakin vs Wire-tailed Manakin
- Lance-tailed Manakin vs Yungas Manakin
- Blue-backed Manakin vs Yungas Manakin
Megapodes
Mitrospingid Tanagers
Mockingbirds and Thrashers
- Grey Catbird vs Northern Mockingbird
- Brown Thrasher vs Grey Catbird
- Curve-billed Thrasher vs Grey Catbird
- Brown Thrasher vs Curve-billed Thrasher
- Northern Mockingbird vs Tropical Mockingbird
- Brown Thrasher vs California Thrasher
- California Thrasher vs Curve-billed Thrasher
- Chalk-browed Mockingbird vs Northern Mockingbird
- Chalk-browed Mockingbird vs Tropical Mockingbird
- Brown Thrasher vs Long-billed Thrasher
- Curve-billed Thrasher vs Long-billed Thrasher
- California Thrasher vs Long-billed Thrasher
- Long-billed Thrasher vs Sage Thrasher
- Crissal Thrasher vs Curve-billed Thrasher
- California Thrasher vs Crissal Thrasher
- Crissal Thrasher vs Long-billed Thrasher
- Crissal Thrasher vs Sage Thrasher
- Chilean Mockingbird vs Northern Mockingbird
- Chilean Mockingbird vs Tropical Mockingbird
- Chalk-browed Mockingbird vs Chilean Mockingbird
- Chilean Mockingbird vs Sage Thrasher
- Chilean Mockingbird vs Pearly-eyed Thrasher
- Crissal Thrasher vs Pearly-eyed Thrasher
- Blue Mockingbird vs Pearly-eyed Thrasher
- Long-tailed Mockingbird vs Tropical Mockingbird
- Chalk-browed Mockingbird vs Long-tailed Mockingbird
- Chilean Mockingbird vs Long-tailed Mockingbird
- Chilean Mockingbird vs White-banded Mockingbird
- Long-tailed Mockingbird vs White-banded Mockingbird
- Chilean Mockingbird vs Patagonian Mockingbird
- Long-tailed Mockingbird vs Patagonian Mockingbird
- Patagonian Mockingbird vs White-banded Mockingbird
- Black Catbird vs Patagonian Mockingbird
- Blue-and-white Mockingbird vs Blue Mockingbird
- Black Catbird vs Blue-and-white Mockingbird
- Bendire's Thrasher vs California Thrasher
- Bendire's Thrasher vs Long-billed Thrasher
- Bendire's Thrasher vs Crissal Thrasher
- Bendire's Thrasher vs Black Catbird
- Bendire's Thrasher vs Scaly-breasted Thrasher
- Galapagos Mockingbird vs Long-tailed Mockingbird
- Galapagos Mockingbird vs White-banded Mockingbird
- Galapagos Mockingbird vs Patagonian Mockingbird
- Galapagos Mockingbird vs Scaly-breasted Thrasher
- Crissal Thrasher vs LeConte's Thrasher
- Bendire's Thrasher vs LeConte's Thrasher
- LeConte's Thrasher vs Scaly-breasted Thrasher
- Crissal Thrasher vs Grey Thrasher
- Bendire's Thrasher vs Grey Thrasher
- Grey Thrasher vs LeConte's Thrasher
- Bahama Mockingbird vs Galapagos Mockingbird
Monarch Flycatchers, Paradise Flycatchers, and Shrikebills
- African Paradise Flycatcher vs Indian Paradise Flycatcher
- Leaden Flycatcher vs Restless Flycatcher
- Leaden Flycatcher vs Shining Flycatcher
- Restless Flycatcher vs Shining Flycatcher
- Satin Flycatcher vs Shining Flycatcher
- Indian Paradise Flycatcher vs Malagasy Paradise Flycatcher
- African Paradise Flycatcher vs Malagasy Paradise Flycatcher
- Broad-billed Flycatcher vs Shining Flycatcher
- Broad-billed Flycatcher vs Satin Flycatcher
- Black Paradise Flycatcher vs Malagasy Paradise Flycatcher
Motmots
- Andean Motmot vs Lesson's Motmot
- Amazonian Motmot vs Lesson's Motmot
- Amazonian Motmot vs Andean Motmot
- Lesson's Motmot vs Whooping Motmot
- Andean Motmot vs Whooping Motmot
- Amazonian Motmot vs Whooping Motmot
- Andean Motmot vs Russet-crowned Motmot
- Amazonian Motmot vs Russet-crowned Motmot
- Russet-crowned Motmot vs Whooping Motmot
- Rufous-capped Motmot vs Rufous Motmot
- Rufous-capped Motmot vs Tody Motmot
- Russet-crowned Motmot vs Tody Motmot
- Blue-throated Motmot vs Tody Motmot
- Blue-throated Motmot vs Rufous-capped Motmot
- Broad-billed Motmot vs Keel-billed Motmot
- Blue-throated Motmot vs Keel-billed Motmot
- Amazonian Motmot vs Trinidad Motmot
- Trinidad Motmot vs Whooping Motmot
- Russet-crowned Motmot vs Trinidad Motmot
Mousebirds
Munias, Parrotfinches, Waxbills, and Allies
- Scaly-breasted Munia vs White-rumped Munia
- Double-barred Finch vs Zebra Finch
- Double-barred Finch vs Red-billed Firefinch
- Red-billed Firefinch vs Zebra Finch
- Chestnut Munia vs Scaly-breasted Munia
- Chestnut Munia vs White-rumped Munia
- Blue Waxbill vs Red-cheeked Cordon-bleu
- African Firefinch vs Red-billed Firefinch
- African Silverbill vs Indian Silverbill
- Beautiful Firetail vs Diamond Firetail
- Long-tailed Finch vs Masked Finch
- Diamond Firetail vs Red-eared Firetail
- Beautiful Firetail vs Red-eared Firetail
- African Firefinch vs Bar-breasted Firefinch
New World Barbets
- Gilded Barbet vs Scarlet-crowned Barbet
- Gilded Barbet vs Spot-crowned Barbet
- Scarlet-crowned Barbet vs Spot-crowned Barbet
- Lemon-throated Barbet vs Red-headed Barbet
- Red-headed Barbet vs Versicolored Barbet
- Lemon-throated Barbet vs Versicolored Barbet
- Gilded Barbet vs White-mantled Barbet
- Scarlet-crowned Barbet vs White-mantled Barbet
- Spot-crowned Barbet vs White-mantled Barbet
- Orange-fronted Barbet vs Scarlet-crowned Barbet
- Orange-fronted Barbet vs Spot-crowned Barbet
- Orange-fronted Barbet vs White-mantled Barbet
New World Blackbirds, Troupials, and Allies
- Common Grackle vs Great-tailed Grackle
- Eastern Meadowlark vs Western Meadowlark
- Boat-tailed Grackle vs Common Grackle
- Boat-tailed Grackle vs Great-tailed Grackle
- Baltimore Oriole vs Orchard Oriole
- Bobolink vs Yellow-breasted Chat
- Yellow-breasted Chat vs Yellow-headed Blackbird
- Bobolink vs Yellow-headed Blackbird
- Brewer's Blackbird vs Rusty Blackbird
- Brown-headed Cowbird vs Shiny Cowbird
- Bronzed Cowbird vs Brown-headed Cowbird
- Bronzed Cowbird vs Shiny Cowbird
- Crested Oropendola vs Montezuma Oropendola
- Altamira Oriole vs Baltimore Oriole
- Altamira Oriole vs Orchard Oriole
- Carib Grackle vs Common Grackle
- Carib Grackle vs Great-tailed Grackle
- Boat-tailed Grackle vs Carib Grackle
- Montezuma Oropendola vs Russet-backed Oropendola
- Crested Oropendola vs Russet-backed Oropendola
- Great-tailed Grackle vs Greater Antillean Grackle
- Boat-tailed Grackle vs Greater Antillean Grackle
- Carib Grackle vs Greater Antillean Grackle
- Orchard Oriole vs Streak-backed Oriole
- Altamira Oriole vs Streak-backed Oriole
- Altamira Oriole vs Yellow-backed Oriole
- Streak-backed Oriole vs Yellow-backed Oriole
- Altamira Oriole vs Scott's Oriole
- Scott's Oriole vs Streak-backed Oriole
- Scott's Oriole vs Yellow-backed Oriole
- Epaulet Oriole vs Streak-backed Oriole
- Epaulet Oriole vs Yellow-backed Oriole
- Epaulet Oriole vs Scott's Oriole
- Epaulet Oriole vs Yellow Oriole
- Austral Blackbird vs Yellow Oriole
- Epaulet Oriole vs Venezuelan Troupial
- Venezuelan Troupial vs Yellow Oriole
- Austral Blackbird vs Venezuelan Troupial
- Chestnut-headed Oropendola vs Montezuma Oropendola
- Chestnut-headed Oropendola vs Crested Oropendola
- Chestnut-headed Oropendola vs Russet-backed Oropendola
- Austral Blackbird vs Chestnut-headed Oropendola
- Brown-headed Cowbird vs Giant Cowbird
- Giant Cowbird vs Shiny Cowbird
- Bronzed Cowbird vs Giant Cowbird
- Yellow-billed Cacique vs Yellow-winged Blackbird
- Giant Cowbird vs Yellow-billed Cacique
- Scarlet-rumped Cacique vs Yellow-rumped Cacique
- Scarlet-rumped Cacique vs Yellow-billed Cacique
- Black-cowled Oriole vs Yellow Oriole
- Black-cowled Oriole vs Venezuelan Troupial
- Red-rumped Cacique vs Yellow-rumped Cacique
- Red-rumped Cacique vs Scarlet-rumped Cacique
- Chihuahuan Meadowlark vs Eastern Meadowlark
- Chihuahuan Meadowlark vs Western Meadowlark
- Chihuahuan Meadowlark vs Chopi Blackbird
- Melodious Blackbird vs Scrub Blackbird
- Chopi Blackbird vs Scrub Blackbird
- Black-cowled Oriole vs Spot-breasted Oriole
- Screaming Cowbird vs Shiny Cowbird
- Bronzed Cowbird vs Screaming Cowbird
- Giant Cowbird vs Screaming Cowbird
- Long-tailed Meadowlark vs Red-breasted Meadowlark
- Oriole Blackbird vs Red-breasted Meadowlark
- Oriole Blackbird vs Screaming Cowbird
- Mexican Cacique vs Oriole Blackbird
- Mexican Cacique vs Red-breasted Meadowlark
- Mexican Cacique vs Screaming Cowbird
- Black-vented Oriole vs Spot-breasted Oriole
- Solitary Cacique vs Yellow-rumped Cacique
- Scarlet-rumped Cacique vs Solitary Cacique
- Red-rumped Cacique vs Solitary Cacique
- Audubon's Oriole vs Spot-breasted Oriole
- Audubon's Oriole vs Black-vented Oriole
- Chestnut-capped Blackbird vs Yellow-hooded Blackbird
- Golden-winged Cacique vs Scarlet-rumped Cacique
- Golden-winged Cacique vs Red-rumped Cacique
- Golden-winged Cacique vs Solitary Cacique
- Cuban Blackbird vs Golden-winged Cacique
- Brown-and-yellow Marshbird vs Yellow-rumped Marshbird
- Cuban Blackbird vs Yellow-rumped Marshbird
- Unicolored Blackbird vs Yellow-winged Blackbird
- Cuban Blackbird vs Unicolored Blackbird
- Mountain Cacique vs Solitary Cacique
- Golden-winged Cacique vs Mountain Cacique
- Long-tailed Meadowlark vs Peruvian Meadowlark
- Peruvian Meadowlark vs Red-breasted Meadowlark
- Orange Oriole vs Scarlet-headed Blackbird
- Orange Oriole vs Puerto Rican Oriole
- Puerto Rican Oriole vs Scarlet-headed Blackbird
- Black-backed Oriole vs Orange Oriole
- Black-backed Oriole vs Scarlet-headed Blackbird
- Black-backed Oriole vs Puerto Rican Oriole
- Chestnut-headed Oropendola vs Olive Oropendola
- Olive Oropendola vs Red-bellied Grackle
- Black-backed Oriole vs Red-bellied Grackle
- Puerto Rican Oriole vs Red-bellied Grackle
- Orange-crowned Oriole vs Orange Oriole
- Orange-crowned Oriole vs Puerto Rican Oriole
- Black-backed Oriole vs Orange-crowned Oriole
- Red-winged Blackbird vs Tawny-shouldered Blackbird
- Hispaniolan Oriole vs Orange-crowned Oriole
- Black-backed Oriole vs Hispaniolan Oriole
- Chestnut-headed Oropendola vs Green Oropendola
- Green Oropendola vs Olive Oropendola
- Dusky-green Oropendola vs Olive Oropendola
- Dusky-green Oropendola vs Green Oropendola
- Hispaniolan Oriole vs Jamaican Oriole
- Jamaican Oriole vs Orange-crowned Oriole
- Jamaican Oriole vs White-edged Oriole
- Boat-tailed Grackle vs Nicaraguan Grackle
- Carib Grackle vs Nicaraguan Grackle
- Greater Antillean Grackle vs Nicaraguan Grackle
- Casqued Cacique vs Golden-winged Cacique
- Casqued Cacique vs Mountain Cacique
New World Quail
- California Quail vs Gambel's Quail
- California Quail vs Scaled Quail
- Gambel's Quail vs Scaled Quail
- Mountain Quail vs Scaled Quail
- Crested Bobwhite vs Northern Bobwhite
- Crested Bobwhite vs Mountain Quail
- Montezuma Quail vs Mountain Quail
- Northern Bobwhite vs Spot-bellied Bobwhite
- Crested Bobwhite vs Spot-bellied Bobwhite
- Northern Bobwhite vs Yucatan Bobwhite
- Crested Bobwhite vs Yucatan Bobwhite
- Spot-bellied Bobwhite vs Yucatan Bobwhite
- Chestnut Wood Quail vs Marbled Wood Quail
- Marbled Wood Quail vs Singing Quail
- Buffy-crowned Wood Partridge vs Singing Quail
- Chestnut Wood Quail vs Spot-winged Wood Quail
- Marbled Wood Quail vs Spot-winged Wood Quail
- Singing Quail vs Spot-winged Wood Quail
- Black-breasted Wood Quail vs Marbled Wood Quail
- Black-breasted Wood Quail vs Spot-winged Wood Quail
- Dark-backed Wood Quail vs Marbled Wood Quail
- Dark-backed Wood Quail vs Spot-winged Wood Quail
- Black-breasted Wood Quail vs Dark-backed Wood Quail
- California Quail vs Elegant Quail
- Elegant Quail vs Gambel's Quail
- Elegant Quail vs Scaled Quail
New World Sparrows
- White-crowned Sparrow vs White-throated Sparrow
- Eastern Towhee vs Spotted Towhee
- Savannah Sparrow vs Spotted Towhee
- Song Sparrow vs Swamp Sparrow
- Savannah Sparrow vs Swamp Sparrow
- Chipping Sparrow vs Field Sparrow
- Field Sparrow vs Savannah Sparrow
- American Tree Sparrow vs California Towhee
- Lincoln's Sparrow vs Song Sparrow
- Lincoln's Sparrow vs Swamp Sparrow
- American Tree Sparrow vs Lincoln's Sparrow
- American Tree Sparrow vs Fox Sparrow
- Fox Sparrow vs Lincoln's Sparrow
- California Towhee vs Fox Sparrow
- Golden-crowned Sparrow vs White-throated Sparrow
- Golden-crowned Sparrow vs White-crowned Sparrow
- Fox Sparrow vs Golden-crowned Sparrow
- Rufous-collared Sparrow vs White-throated Sparrow
- Rufous-collared Sparrow vs White-crowned Sparrow
- Golden-crowned Sparrow vs Rufous-collared Sparrow
- Lark Sparrow vs Rufous-collared Sparrow
- Lark Sparrow vs Vesper Sparrow
- California Towhee vs Canyon Towhee
- Black-throated Sparrow vs Grasshopper Sparrow
- Black-throated Sparrow vs Canyon Towhee
- Eastern Towhee vs Green-tailed Towhee
- Green-tailed Towhee vs Spotted Towhee
- Golden-crowned Sparrow vs Harris's Sparrow
- Harris's Sparrow vs Rufous-collared Sparrow
- Harris's Sparrow vs White-crowned Sparrow
- Lark Bunting vs Olive Sparrow
- Dark-eyed Junco vs Yellow-eyed Junco
- Lark Bunting vs Yellow-eyed Junco
- Lark Bunting vs Orange-billed Sparrow
- Black-striped Sparrow vs Olive Sparrow
- Chestnut-capped Brushfinch vs Orange-billed Sparrow
- Nelson's Sparrow vs Seaside Sparrow
- Cassin's Sparrow vs Rufous-winged Sparrow
- LeConte's Sparrow vs Seaside Sparrow
- LeConte's Sparrow vs Nelson's Sparrow
- Grasshopper Sparrow vs Grassland Sparrow
- Saltmarsh Sparrow vs Seaside Sparrow
- Nelson's Sparrow vs Saltmarsh Sparrow
- LeConte's Sparrow vs Saltmarsh Sparrow
- Rufous-winged Sparrow vs Stripe-headed Sparrow
- Cassin's Sparrow vs Stripe-headed Sparrow
- Grasshopper Sparrow vs Yellow-browed Sparrow
- Grassland Sparrow vs Yellow-browed Sparrow
- Black-chinned Sparrow vs Field Sparrow
- Green-backed Sparrow vs Olive Sparrow
- Black-striped Sparrow vs Green-backed Sparrow
- Bell's Sparrow vs Sagebrush Sparrow
- Rufous-crowned Sparrow vs Rusty Sparrow
- California Towhee vs White-eared Ground Sparrow
- Canyon Towhee vs White-eared Ground Sparrow
- Sooty-capped Chlorospingus vs Yellow-throated Chlorospingus
- Slaty Brushfinch vs White-naped Brushfinch
- White-naped Brushfinch vs Yellow-breasted Brushfinch
- Slaty Brushfinch vs Yellow-breasted Brushfinch
- White-naped Brushfinch vs Yellow-thighed Brushfinch
- Slaty Brushfinch vs Yellow-thighed Brushfinch
- Yellow-breasted Brushfinch vs Yellow-thighed Brushfinch
- Botteri's Sparrow vs Stripe-headed Sparrow
- Dusky Chlorospingus vs Yellow-throated Chlorospingus
- Dusky Chlorospingus vs Sooty-capped Chlorospingus
- Grey-browed Brushfinch vs Orange-billed Sparrow
- Chestnut-capped Brushfinch vs Grey-browed Brushfinch
- Choco Brushfinch vs Slaty Brushfinch
- Choco Brushfinch vs Yellow-breasted Brushfinch
- Choco Brushfinch vs Yellow-thighed Brushfinch
- Choco Brushfinch vs Pale-naped Brushfinch
- Pale-naped Brushfinch vs Yellow-thighed Brushfinch
- Pale-naped Brushfinch vs Yellow-breasted Brushfinch
- Orange-billed Sparrow vs Pectoral Sparrow
- Chestnut-capped Brushfinch vs Pectoral Sparrow
- Grey-browed Brushfinch vs Pectoral Sparrow
- Large-footed Finch vs Pectoral Sparrow
- Canyon Towhee vs White-throated Towhee
- White-eared Ground Sparrow vs White-throated Towhee
- Large-footed Finch vs White-throated Towhee
- Baird's Sparrow vs Henslow's Sparrow
- Baird's Sparrow vs Large-footed Finch
- Ashy-throated Chlorospingus vs Yellow-throated Chlorospingus
- Ashy-throated Chlorospingus vs Sooty-capped Chlorospingus
- Ashy-throated Chlorospingus vs Dusky Chlorospingus
- Grey-browed Brushfinch vs Saffron-billed Sparrow
- Pectoral Sparrow vs Saffron-billed Sparrow
- Prevost's Ground Sparrow vs White-eared Ground Sparrow
- Prevost's Ground Sparrow vs White-throated Towhee
- Rufous-capped Brushfinch vs Santa Marta Brushfinch
- Rusty-crowned Ground Sparrow vs White-eared Ground Sparrow
- Rusty-crowned Ground Sparrow vs White-throated Towhee
- Prevost's Ground Sparrow vs Rusty-crowned Ground Sparrow
- Santa Marta Brushfinch vs White-winged Brushfinch
- Rufous-capped Brushfinch vs White-winged Brushfinch
- Five-striped Sparrow vs White-winged Brushfinch
- Five-striped Sparrow vs Striped Sparrow
- Striped Sparrow vs White-winged Brushfinch
- Grey-browed Brushfinch vs Moss-backed Sparrow
- Moss-backed Sparrow vs Pectoral Sparrow
- Moss-backed Sparrow vs Saffron-billed Sparrow
- Five-striped Sparrow vs Moss-backed Sparrow
- Moss-backed Sparrow vs Striped Sparrow
- Saffron-billed Sparrow vs Sooty-faced Finch
- Moss-backed Sparrow vs Sooty-faced Finch
- Ochre-breasted Brushfinch vs Santa Marta Brushfinch
- Ochre-breasted Brushfinch vs Rufous-capped Brushfinch
- Ochre-breasted Brushfinch vs White-winged Brushfinch
- Dark-eyed Junco vs Volcano Junco
- Volcano Junco vs Yellow-eyed Junco
- Black-headed Brushfinch vs Moss-backed Sparrow
- Black-headed Brushfinch vs Sooty-faced Finch
- Black-headed Brushfinch vs Green-striped Brushfinch
- Cabanis's Ground Sparrow vs White-throated Towhee
- Cabanis's Ground Sparrow vs Prevost's Ground Sparrow
- Cabanis's Ground Sparrow vs Rusty-crowned Ground Sparrow
- Moustached Brushfinch vs White-winged Brushfinch
- Moustached Brushfinch vs Ochre-breasted Brushfinch
- Black-headed Brushfinch vs Sierra Nevada Brushfinch
- Green-striped Brushfinch vs Sierra Nevada Brushfinch
- Black-capped Sparrow vs Olive Finch
- Black-capped Sparrow vs Sierra Nevada Brushfinch
- Olive Finch vs Sierra Nevada Brushfinch
- Collared Towhee vs Eastern Towhee
- Collared Towhee vs Spotted Towhee
- Collared Towhee vs Green-tailed Towhee
- Botteri's Sparrow vs Bridled Sparrow
- Grey-eared Brushfinch vs Ochre-breasted Brushfinch
- Grey-eared Brushfinch vs Moustached Brushfinch
- Ashy-throated Chlorospingus vs Yellow-whiskered Chlorospingus
- Black-capped Sparrow vs Half-collared Sparrow
- Half-collared Sparrow vs Olive Finch
New World Vultures
- Lesser Yellow-headed Vulture vs Turkey Vulture
- Black Vulture vs Lesser Yellow-headed Vulture
- Black Vulture vs King Vulture
- King Vulture vs Lesser Yellow-headed Vulture
- Andean Condor vs Black Vulture
- Andean Condor vs King Vulture
- Andean Condor vs Lesser Yellow-headed Vulture
- Greater Yellow-headed Vulture vs Turkey Vulture
- Greater Yellow-headed Vulture vs Lesser Yellow-headed Vulture
- Greater Yellow-headed Vulture vs King Vulture
- Andean Condor vs Greater Yellow-headed Vulture
New World Warblers
- Mangrove Warbler vs Yellow-rumped Warbler
- American Redstart vs Yellow-rumped Warbler
- American Redstart vs Mangrove Warbler
- Northern Parula vs Yellow-rumped Warbler
- Mangrove Warbler vs Northern Parula
- American Redstart vs Northern Parula
- Black-and-white Warbler vs Northern Parula
- Black-and-white Warbler vs Orange-crowned Warbler
- Mangrove Warbler vs Pine Warbler
- American Redstart vs Pine Warbler
- Black-and-white Warbler vs Pine Warbler
- Northern Parula vs Pine Warbler
- American Redstart vs Palm Warbler
- Northern Parula vs Palm Warbler
- Palm Warbler vs Pine Warbler
- Ovenbird vs Palm Warbler
- Ovenbird vs Pine Warbler
- Orange-crowned Warbler vs Ovenbird
- Black-throated Green Warbler vs Northern Parula
- Black-throated Green Warbler vs Pine Warbler
- Black-throated Green Warbler vs Palm Warbler
- Black-throated Green Warbler vs Magnolia Warbler
- Black-throated Green Warbler vs Chestnut-sided Warbler
- Chestnut-sided Warbler vs Magnolia Warbler
- Nashville Warbler vs Orange-crowned Warbler
- Orange-crowned Warbler vs Tennessee Warbler
- Nashville Warbler vs Tennessee Warbler
- Blackburnian Warbler vs Magnolia Warbler
- Blackburnian Warbler vs Chestnut-sided Warbler
- Black-throated Blue Warbler vs Blackburnian Warbler
- Blackburnian Warbler vs Blackpoll Warbler
- Black-throated Blue Warbler vs Blackpoll Warbler
- Blackburnian Warbler vs Yellow-throated Warbler
- Black-throated Blue Warbler vs Yellow-throated Warbler
- Blackpoll Warbler vs Yellow-throated Warbler
- Blackpoll Warbler vs Townsend's Warbler
- Townsend's Warbler vs Yellow-throated Warbler
- Hooded Warbler vs Yellow-throated Warbler
- Hooded Warbler vs Townsend's Warbler
- Prairie Warbler vs Townsend's Warbler
- Hooded Warbler vs Prairie Warbler
- Cape May Warbler vs Prairie Warbler
- Cape May Warbler vs Hooded Warbler
- Bay-breasted Warbler vs Cape May Warbler
- Bay-breasted Warbler vs Prairie Warbler
- Louisiana Waterthrush vs Northern Waterthrush
- Louisiana Waterthrush vs Prothonotary Warbler
- Canada Warbler vs Wilson's Warbler
- Canada Warbler vs Prothonotary Warbler
- Bay-breasted Warbler vs Black-throated Grey Warbler
- Black-throated Grey Warbler vs Prothonotary Warbler
- Black-throated Grey Warbler vs Cape May Warbler
- Common Yellowthroat vs MacGillivray's Warbler
- Black-throated Grey Warbler vs Tropical Parula
- Common Yellowthroat vs Mourning Warbler
- MacGillivray's Warbler vs Mourning Warbler
- Mourning Warbler vs Worm-eating Warbler
- Slate-throated Whitestart vs Worm-eating Warbler
- Common Yellowthroat vs Kentucky Warbler
- Kentucky Warbler vs MacGillivray's Warbler
- Kentucky Warbler vs Mourning Warbler
- Kentucky Warbler vs Worm-eating Warbler
- Lucy's Warbler vs Orange-crowned Warbler
- Lucy's Warbler vs Nashville Warbler
- Lucy's Warbler vs Tennessee Warbler
- Blue-winged Warbler vs Golden-winged Warbler
- Cerulean Warbler vs Tropical Parula
- Hermit Warbler vs Tropical Parula
- Cerulean Warbler vs Hermit Warbler
- Painted Whitestart vs Slate-throated Whitestart
- Cerulean Warbler vs Grace's Warbler
- Grace's Warbler vs Hermit Warbler
- Lucy's Warbler vs Virginia's Warbler
- Tennessee Warbler vs Virginia's Warbler
- MacGillivray's Warbler vs Southern Yellowthroat
- Mourning Warbler vs Southern Yellowthroat
- Kentucky Warbler vs Southern Yellowthroat
- Grey-crowned Yellowthroat vs Southern Yellowthroat
- Golden-crowned Warbler vs Three-striped Warbler
- Swainson's Warbler vs Three-striped Warbler
- Grey-crowned Yellowthroat vs Swainson's Warbler
- Swainson's Warbler vs White-rimmed Warbler
- Russet-crowned Warbler vs White-rimmed Warbler
- Black-crested Warbler vs White-rimmed Warbler
- Black-crested Warbler vs Russet-crowned Warbler
- Slate-throated Whitestart vs Spectacled Whitestart
- Painted Whitestart vs Spectacled Whitestart
- Connecticut Warbler vs Spectacled Whitestart
- Black-crested Warbler vs Connecticut Warbler
- Flavescent Warbler vs White-rimmed Warbler
- Flavescent Warbler vs Russet-crowned Warbler
- Black-crested Warbler vs Flavescent Warbler
- Cerulean Warbler vs Golden-cheeked Warbler
- Golden-cheeked Warbler vs Hermit Warbler
- Golden-cheeked Warbler vs Grace's Warbler
- Adelaide's Warbler vs Golden-cheeked Warbler
- Collared Whitestart vs Painted Whitestart
- Collared Whitestart vs Spectacled Whitestart
- Olive-crowned Yellowthroat vs Southern Yellowthroat
- Grey-crowned Yellowthroat vs Olive-crowned Yellowthroat
- Red Warbler vs Wilson's Warbler
- Canada Warbler vs Red Warbler
- Black-eared Warbler vs Three-striped Warbler
- Golden-cheeked Warbler vs Kirtland's Warbler
- Adelaide's Warbler vs Kirtland's Warbler
- American Yellow Warbler vs Golden-cheeked Warbler
- Adelaide's Warbler vs American Yellow Warbler
- American Yellow Warbler vs Kirtland's Warbler
- Canada Warbler vs Pink-headed Warbler
- Pink-headed Warbler vs Red Warbler
- Kirtland's Warbler vs Plumbeous Warbler
- American Yellow Warbler vs Plumbeous Warbler
New Zealand Parrots
Nightjars and Nighthawks
- Common Nighthawk vs Lesser Nighthawk
- Chuck-will's-widow vs Eastern Whip-poor-will
- Chuck-will's-widow vs Common Poorwill
- European Nightjar vs Savanna Nightjar
- Common Poorwill vs Savanna Nightjar
- European Nightjar vs Fiery-necked Nightjar
- Common Poorwill vs Fiery-necked Nightjar
- Fiery-necked Nightjar vs Savanna Nightjar
- European Nightjar vs Large-tailed Nightjar
- Large-tailed Nightjar vs Savanna Nightjar
- Fiery-necked Nightjar vs Large-tailed Nightjar
- Indian Nightjar vs Savanna Nightjar
- Fiery-necked Nightjar vs Indian Nightjar
- Indian Nightjar vs Large-tailed Nightjar
- Eastern Whip-poor-will vs Mexican Whip-poor-will
- Chuck-will's-widow vs Mexican Whip-poor-will
- Band-winged Nightjar vs Short-tailed Nighthawk
- Antillean Nighthawk vs Common Nighthawk
- Antillean Nighthawk vs Lesser Nighthawk
- Antillean Nighthawk vs Band-winged Nightjar
- Jerdon's Nightjar vs Large-tailed Nightjar
- Indian Nightjar vs Jerdon's Nightjar
- Band-winged Nightjar vs Jerdon's Nightjar
- Large-tailed Nightjar vs Red-necked Nightjar
- Indian Nightjar vs Red-necked Nightjar
- Jerdon's Nightjar vs Red-necked Nightjar
- Common Nighthawk vs Nacunda Nighthawk
- Lesser Nighthawk vs Nacunda Nighthawk
- Antillean Nighthawk vs Nacunda Nighthawk
- Jerdon's Nightjar vs Square-tailed Nightjar
- Red-necked Nightjar vs Square-tailed Nightjar
- Jerdon's Nightjar vs Jungle Nightjar
- Jungle Nightjar vs Red-necked Nightjar
- Jungle Nightjar vs Square-tailed Nightjar
- Freckled Nightjar vs Square-tailed Nightjar
- Freckled Nightjar vs Jungle Nightjar
- Jungle Nightjar vs Rufous-cheeked Nightjar
- Freckled Nightjar vs Rufous-cheeked Nightjar
- Grey Nightjar vs Rufous-cheeked Nightjar
- Freckled Nightjar vs Grey Nightjar
- Grey Nightjar vs Jungle Nightjar
- Eastern Whip-poor-will vs Rufous Nightjar
- Chuck-will's-widow vs Rufous Nightjar
- Mexican Whip-poor-will vs Rufous Nightjar
- Spotted Nightjar vs White-throated Nightjar
- Scissor-tailed Nightjar vs White-tailed Nightjar
- Lesser Nighthawk vs Sand-colored Nighthawk
- Antillean Nighthawk vs Sand-colored Nighthawk
- Nacunda Nighthawk vs Sand-colored Nighthawk
- Buff-collared Nightjar vs Mexican Whip-poor-will
- Buff-collared Nightjar vs Rufous Nightjar
- Rufous-bellied Nighthawk vs Short-tailed Nighthawk
- Antillean Nighthawk vs Least Nighthawk
- Least Nighthawk vs Nacunda Nighthawk
- Least Nighthawk vs Sand-colored Nighthawk
- Dusky Nightjar vs Mexican Whip-poor-will
- Dusky Nightjar vs Rufous Nightjar
- Buff-collared Nightjar vs Dusky Nightjar
Northern Storm Petrels
Nuthatches
- Red-breasted Nuthatch vs White-breasted Nuthatch
- Eurasian Nuthatch vs White-breasted Nuthatch
- Eurasian Nuthatch vs Red-breasted Nuthatch
- Pygmy Nuthatch vs Red-breasted Nuthatch
- Eurasian Nuthatch vs Pygmy Nuthatch
- Eurasian Nuthatch vs Velvet-fronted Nuthatch
- Pygmy Nuthatch vs Velvet-fronted Nuthatch
- Chestnut-vented Nuthatch vs Krüper's Nuthatch
- Eastern Rock Nuthatch vs Krüper's Nuthatch
- Chinese Nuthatch vs Krüper's Nuthatch
- Chinese Nuthatch vs Eastern Rock Nuthatch
Old World Buntings
- Common Reed Bunting vs Yellowhammer
- Corn Bunting vs Yellowhammer
- Common Reed Bunting vs Corn Bunting
- Cirl Bunting vs Yellowhammer
- Cirl Bunting vs Common Reed Bunting
- Cirl Bunting vs Corn Bunting
- Corn Bunting vs Rock Bunting
- Cirl Bunting vs Rock Bunting
- Corn Bunting vs Ortolan Bunting
- Cirl Bunting vs Ortolan Bunting
- Ortolan Bunting vs Rock Bunting
- Cirl Bunting vs Golden-breasted Bunting
- Golden-breasted Bunting vs Rock Bunting
- Golden-breasted Bunting vs Ortolan Bunting
- Cape Bunting vs Golden-breasted Bunting
- Cinnamon-breasted Bunting vs Golden-breasted Bunting
- Cape Bunting vs Cinnamon-breasted Bunting
- Cape Bunting vs Little Bunting
- Cinnamon-breasted Bunting vs Little Bunting
- Black-headed Bunting vs Meadow Bunting
- Crested Bunting vs Cretzschmar's Bunting
- Crested Bunting vs Pallas's Reed Bunting
- Cretzschmar's Bunting vs Pallas's Reed Bunting
- Chestnut-eared Bunting vs Pallas's Reed Bunting
- Pallas's Reed Bunting vs Yellow-breasted Bunting
- Chestnut-eared Bunting vs Yellow-breasted Bunting
- Grey-necked Bunting vs Striolated Bunting
- Chestnut Bunting vs Godlewski's Bunting
- Godlewski's Bunting vs Yellow Bunting
Old World Orioles
- Black-hooded Oriole vs Eurasian Golden Oriole
- Eurasian Golden Oriole vs Indian Golden Oriole
- Black-hooded Oriole vs Indian Golden Oriole
- Eurasian Golden Oriole vs Olive-backed Oriole
- Black-hooded Oriole vs Olive-backed Oriole
- Indian Golden Oriole vs Olive-backed Oriole
- Black-headed Oriole vs Black-hooded Oriole
- Black-headed Oriole vs Indian Golden Oriole
- Black-headed Oriole vs Olive-backed Oriole
- Black-naped Oriole vs Indian Golden Oriole
- Black-naped Oriole vs Olive-backed Oriole
- Black-headed Oriole vs Black-naped Oriole
- African Golden Oriole vs Maroon Oriole
Old World Parrots
- Crimson Rosella vs Eastern Rosella
- Australian King Parrot vs Red-rumped Parrot
- Plum-headed Parakeet vs Rose-ringed Parakeet
- Plum-headed Parakeet vs Red-rumped Parrot
- Alexandrine Parakeet vs Rose-ringed Parakeet
- Alexandrine Parakeet vs Red-rumped Parrot
- Alexandrine Parakeet vs Plum-headed Parakeet
- Coconut Lorikeet vs Scaly-breasted Lorikeet
- Australian Ringneck vs Scaly-breasted Lorikeet
- Alexandrine Parakeet vs Australian Ringneck
- Crimson Rosella vs Pale-headed Rosella
- Eastern Rosella vs Pale-headed Rosella
- Blue-winged Parakeet vs Rose-ringed Parakeet
- Blue-winged Parakeet vs Plum-headed Parakeet
- Alexandrine Parakeet vs Blue-winged Parakeet
- Blue-winged Parakeet vs Budgerigar
- Budgerigar vs Rosy-faced Lovebird
- Coconut Lorikeet vs Red-collared Lorikeet
- Red-collared Lorikeet vs Scaly-breasted Lorikeet
- Crimson Rosella vs Green Rosella
- Eastern Rosella vs Green Rosella
- Green Rosella vs Pale-headed Rosella
- Blue-winged Parakeet vs Long-tailed Parakeet
- Blue-winged Parakeet vs Slaty-headed Parakeet
- Long-tailed Parakeet vs Slaty-headed Parakeet
- Blue-winged Parrot vs Red-capped Parrot
- Red-capped Parrot vs Red-crowned Parakeet
- Red-capped Parrot vs Swift Parrot
- Red-crowned Parakeet vs Swift Parrot
- Moluccan Eclectus vs Swift Parrot
- Blue-winged Parrot vs Turquoise Parrot
- Turquoise Parrot vs Varied Lorikeet
- Little Lorikeet vs Varied Lorikeet
- Regent Parrot vs Superb Parrot
- Regent Parrot vs Varied Lorikeet
- Blue-crowned Hanging Parrot vs Sri Lanka Hanging Parrot
- Blue-winged Parrot vs Elegant Parrot
- Elegant Parrot vs Turquoise Parrot
- Blue-crowned Hanging Parrot vs Philippine Hanging Parrot
- Philippine Hanging Parrot vs Sri Lanka Hanging Parrot
- Pale-headed Rosella vs Western Rosella
- Green Rosella vs Western Rosella
- Little Lorikeet vs Purple-crowned Lorikeet
- Red-crowned Parakeet vs Yellow-crowned Parakeet
- Northern Rosella vs Pale-headed Rosella
- Green Rosella vs Northern Rosella
- Northern Rosella vs Western Rosella
- Blossom-headed Parakeet vs Long-tailed Parakeet
- Blossom-headed Parakeet vs Slaty-headed Parakeet
- Blossom-headed Parakeet vs Bourke's Parrot
- Fischer's Lovebird vs Rosy-faced Lovebird
- Bourke's Parrot vs Fischer's Lovebird
- Rosy-faced Lovebird vs Yellow-collared Lovebird
- Fischer's Lovebird vs Yellow-collared Lovebird
- Layard's Parakeet vs Long-tailed Parakeet
- Layard's Parakeet vs Slaty-headed Parakeet
- Blossom-headed Parakeet vs Layard's Parakeet
Ovenbirds and Woodcreepers
- Olivaceous Woodcreeper vs Streak-headed Woodcreeper
- Cocoa Woodcreeper vs Olivaceous Woodcreeper
- Olivaceous Woodcreeper vs Wedge-billed Woodcreeper
- Narrow-billed Woodcreeper vs Streak-headed Woodcreeper
- Narrow-billed Woodcreeper vs Wedge-billed Woodcreeper
- Azara's Spinetail vs Wedge-billed Woodcreeper
- Cocoa Woodcreeper vs Ivory-billed Woodcreeper
- Ivory-billed Woodcreeper vs Wedge-billed Woodcreeper
- Montane Woodcreeper vs Streak-headed Woodcreeper
- Montane Woodcreeper vs Narrow-billed Woodcreeper
- Azara's Spinetail vs Sooty-fronted Spinetail
- Sooty-fronted Spinetail vs Wren-like Rushbird
- Plain-mantled Tit-Spinetail vs Wren-like Rushbird
- Pale-legged Hornero vs Rufous Hornero
- Pale-legged Hornero vs Wren-like Rushbird
- Azara's Spinetail vs Spix's Spinetail
- Sooty-fronted Spinetail vs Spix's Spinetail
- Cocoa Woodcreeper vs Spotted Woodcreeper
- Ivory-billed Woodcreeper vs Spotted Woodcreeper
- Slaty Spinetail vs Sooty-fronted Spinetail
- Slaty Spinetail vs Spix's Spinetail
- Buff-winged Cinclodes vs Dark-bellied Cinclodes
- Rufous-capped Spinetail vs Spix's Spinetail
- Rufous-capped Spinetail vs Slaty Spinetail
- Spot-crowned Woodcreeper vs Streak-headed Woodcreeper
- Narrow-billed Woodcreeper vs Spot-crowned Woodcreeper
- Montane Woodcreeper vs Spot-crowned Woodcreeper
- Lesser Woodcreeper vs Spotted Woodcreeper
- Chotoy Spinetail vs Ochre-throated Foliage-gleaner
- Freckle-breasted Thornbird vs Greater Thornbird
- Chotoy Spinetail vs Freckle-breasted Thornbird
- Chotoy Spinetail vs Firewood-gatherer
- Firewood-gatherer vs Freckle-breasted Thornbird
- Red-faced Spinetail vs Stripe-crowned Spinetail
- Firewood-gatherer vs Stripe-crowned Spinetail
- Lineated Foliage-gleaner vs Scimitar-billed Woodcreeper
- Buff-browed Foliage-gleaner vs Scimitar-billed Woodcreeper
- Buff-browed Foliage-gleaner vs Lineated Foliage-gleaner
- Greater Thornbird vs Rufous-fronted Thornbird
- Freckle-breasted Thornbird vs Rufous-fronted Thornbird
- Rufous-fronted Thornbird vs Scimitar-billed Woodcreeper
- Rufous-fronted Thornbird vs Sharp-tailed Streamcreeper
- Ochre-throated Foliage-gleaner vs White-eyed Foliage-gleaner
- Sharp-tailed Streamcreeper vs White-eyed Foliage-gleaner
- Plain-brown Woodcreeper vs Tawny-winged Woodcreeper
- Sharp-tailed Streamcreeper vs Tawny-winged Woodcreeper
- Pallid Spinetail vs Red-faced Spinetail
- Pallid Spinetail vs Stripe-crowned Spinetail
- Montane Foliage-gleaner vs Scaly-throated Foliage-gleaner
- Band-tailed Hornero vs Rufous Hornero
- Band-tailed Hornero vs Pale-legged Hornero
- Band-tailed Hornero vs Lark-like Brushrunner
- Lark-like Brushrunner vs Streaked Tuftedcheek
- Black-striped Woodcreeper vs Spotted Woodcreeper
- Black-striped Woodcreeper vs Lesser Woodcreeper
- Black-striped Woodcreeper vs Lark-like Brushrunner
- Pearled Treerunner vs Ruddy Treerunner
- Plain-brown Woodcreeper vs Ruddy Woodcreeper
- Ruddy Woodcreeper vs Tawny-winged Woodcreeper
- Northern Barred Woodcreeper vs Planalto Woodcreeper
- Planalto Woodcreeper vs White-throated Treerunner
- Common Miner vs White-throated Treerunner
- Rufous-capped Spinetail vs Rufous Spinetail
- Common Miner vs Rufous-banded Miner
- Lesser Woodcreeper vs Olive-backed Woodcreeper
- Black-striped Woodcreeper vs Olive-backed Woodcreeper
- Greater Thornbird vs Plain Thornbird
- Freckle-breasted Thornbird vs Plain Thornbird
- Plain Thornbird vs Rufous-fronted Thornbird
- Buff-winged Cinclodes vs Grey-flanked Cinclodes
- Dark-bellied Cinclodes vs Grey-flanked Cinclodes
- Cordilleran Canastero vs Sharp-billed Canastero
- Orange-eyed Thornbird vs Plain Thornbird
- Plain-crowned Spinetail vs Rufous Spinetail
- Dusky-tailed Canastero vs Long-billed Woodcreeper
- Rufous Spinetail vs Silvery-throated Spinetail
- Plain-crowned Spinetail vs Silvery-throated Spinetail
- Long-billed Woodcreeper vs Silvery-throated Spinetail
- Crested Spinetail vs Red-faced Spinetail
- Crested Spinetail vs Stripe-crowned Spinetail
- Crested Spinetail vs Pallid Spinetail
- Grey-flanked Cinclodes vs Stout-billed Cinclodes
- Chaco Earthcreeper vs Cinnamon-throated Woodcreeper
- Many-striped Canastero vs Sharp-billed Canastero
- Cordilleran Canastero vs Many-striped Canastero
- Black-banded Woodcreeper vs Northern Barred Woodcreeper
- Black-banded Woodcreeper vs Planalto Woodcreeper
- Brown-billed Scythebill vs Red-billed Scythebill
- Araucaria Tit-Spinetail vs Plain-mantled Tit-Spinetail
- Grey-flanked Cinclodes vs White-winged Cinclodes
- Stout-billed Cinclodes vs White-winged Cinclodes
- Sharp-billed Canastero vs Short-billed Canastero
- Cordilleran Canastero vs Short-billed Canastero
- Many-striped Canastero vs Short-billed Canastero
- Montane Foliage-gleaner vs Ochre-breasted Foliage-gleaner
- Ochre-breasted Foliage-gleaner vs Scaly-throated Foliage-gleaner
- Chilean Seaside Cinclodes vs White-winged Cinclodes
- Chilean Seaside Cinclodes vs Stout-billed Cinclodes
- Andean Tit-Spinetail vs Plain-mantled Tit-Spinetail
- Andean Tit-Spinetail vs Araucaria Tit-Spinetail
- Strong-billed Woodcreeper vs White-throated Woodcreeper
- Great Rufous Woodcreeper vs Strong-billed Woodcreeper
- Great Rufous Woodcreeper vs White-throated Woodcreeper
- Dark-breasted Spinetail vs Silvery-throated Spinetail
- Black-striped Woodcreeper vs Striped Woodcreeper
- Olive-backed Woodcreeper vs Striped Woodcreeper
- Black-striped Woodcreeper vs Elegant Woodcreeper
- Elegant Woodcreeper vs Olive-backed Woodcreeper
- Elegant Woodcreeper vs Striped Woodcreeper
- Grey-bellied Spinetail vs Silvery-throated Spinetail
- Dark-breasted Spinetail vs Grey-bellied Spinetail
- Amazonian Plain Xenops vs Streaked Xenops
- Amazonian Barred Woodcreeper vs Northern Barred Woodcreeper
- Amazonian Barred Woodcreeper vs Planalto Woodcreeper
- Amazonian Barred Woodcreeper vs Black-banded Woodcreeper
- Many-striped Canastero vs Rusty-vented Canastero
- Rusty-vented Canastero vs Short-billed Canastero
- Chiriqui Foliage-gleaner vs Ochre-throated Foliage-gleaner
- Chiriqui Foliage-gleaner vs White-eyed Foliage-gleaner
- Dark-breasted Spinetail vs Stripe-breasted Spinetail
- Grey-bellied Spinetail vs Stripe-breasted Spinetail
- Brown Cacholote vs Grey-crested Cacholote
- Plain-brown Woodcreeper vs Tyrannine Woodcreeper
- Tawny-winged Woodcreeper vs Tyrannine Woodcreeper
- Ruddy Woodcreeper vs Tyrannine Woodcreeper
- Little Thornbird vs Plain Thornbird
- Little Thornbird vs Orange-eyed Thornbird
- Dark-breasted Spinetail vs White-whiskered Spinetail
- Grey-bellied Spinetail vs White-whiskered Spinetail
- Stripe-breasted Spinetail vs White-whiskered Spinetail
- Montane Woodcreeper vs White-striped Woodcreeper
- Spot-crowned Woodcreeper vs White-striped Woodcreeper
- Scalloped Woodcreeper vs Spot-crowned Woodcreeper
- Scalloped Woodcreeper vs White-striped Woodcreeper
- Short-billed Canastero vs White-chinned Thistletail
- Rusty-vented Canastero vs White-chinned Thistletail
- Crested Hornero vs Pale-legged Hornero
- Band-tailed Hornero vs Crested Hornero
- Brown Cacholote vs Caatinga Cacholote
- Caatinga Cacholote vs Grey-crested Cacholote
- Rufous-breasted Leaftosser vs Scaly-throated Leaftosser
- Scaled Woodcreeper vs Spot-crowned Woodcreeper
- Scaled Woodcreeper vs White-striped Woodcreeper
- Scaled Woodcreeper vs Scalloped Woodcreeper
- Crested Spinetail vs Olive Spinetail
- Streak-capped Treehunter vs Striped Treehunter
- Streak-capped Treehunter vs Uniform Treehunter
- Striped Treehunter vs Uniform Treehunter
- Creamy-crested Spinetail vs Olive Spinetail
- Common Miner vs Puna Miner
- Puna Miner vs Rufous-banded Miner
- Puna Miner vs Sharp-billed Treehunter
- Rufous-breasted Leaftosser vs Tawny-throated Leaftosser
- Scaly-throated Leaftosser vs Tawny-throated Leaftosser
- Sharp-billed Treehunter vs Tawny-throated Leaftosser
- Line-cheeked Spinetail vs Olive Spinetail
- Creamy-crested Spinetail vs Line-cheeked Spinetail
- Line-cheeked Spinetail vs White-browed Spinetail
- Necklaced Spinetail vs White-browed Spinetail
- Grey-throated Leaftosser vs Rufous-breasted Leaftosser
- Grey-throated Leaftosser vs Scaly-throated Leaftosser
- Grey-throated Leaftosser vs Tawny-throated Leaftosser
- Grey-throated Leaftosser vs White-browed Spinetail
- Streak-breasted Treehunter vs Streak-capped Treehunter
- Streak-breasted Treehunter vs Striped Treehunter
- Streak-breasted Treehunter vs Uniform Treehunter
- Buffy Tuftedcheek vs Streaked Tuftedcheek
- Rusty-fronted Canastero vs White-chinned Thistletail
- Coastal Miner vs Common Miner
- Coastal Miner vs Rufous-banded Miner
- Coastal Miner vs Puna Miner
- Streak-backed Canastero vs White-chinned Thistletail
- Rusty-fronted Canastero vs Streak-backed Canastero
- Guianan Woodcreeper vs White-striped Woodcreeper
- Guianan Woodcreeper vs Scalloped Woodcreeper
- Guianan Woodcreeper vs Scaled Woodcreeper
- Pacific Tuftedcheek vs Streaked Tuftedcheek
- Buffy Tuftedcheek vs Pacific Tuftedcheek
- Pacific Tuftedcheek vs Point-tailed Palmcreeper
- Guianan Woodcreeper vs Point-tailed Palmcreeper
- Buff-breasted Earthcreeper vs Scale-throated Earthcreeper
- Buff-breasted Earthcreeper vs Point-tailed Palmcreeper
- Buff-breasted Earthcreeper vs Pale-browed Treehunter
- Pale-browed Treehunter vs Point-tailed Palmcreeper
- Olive Spinetail vs Streak-capped Spinetail
- Creamy-crested Spinetail vs Streak-capped Spinetail
- Line-cheeked Spinetail vs Streak-capped Spinetail
- Pale-browed Treehunter vs Streak-capped Spinetail
- Araucaria Tit-Spinetail vs Brown-capped Tit-Spinetail
- Andean Tit-Spinetail vs Brown-capped Tit-Spinetail
- Austral Canastero vs Rusty-fronted Canastero
- Austral Canastero vs Streak-backed Canastero
- Necklaced Spinetail vs Ochre-cheeked Spinetail
- Black-billed Scythebill vs Red-billed Scythebill
- Black-billed Scythebill vs Brown-billed Scythebill
- Necklaced Spinetail vs Rusty-headed Spinetail
- Ochre-cheeked Spinetail vs Rusty-headed Spinetail
- Chestnut-rumped Woodcreeper vs Striped Woodcreeper
- Chestnut-rumped Woodcreeper vs Elegant Woodcreeper
- Chestnut-rumped Woodcreeper vs Curve-billed Reedhaunter
- Plain Thornbird vs Streak-fronted Thornbird
- Orange-eyed Thornbird vs Streak-fronted Thornbird
- Little Thornbird vs Streak-fronted Thornbird
- Curve-billed Reedhaunter vs Streak-fronted Thornbird
- Brown Cacholote vs White-throated Cacholote
- Grey-crested Cacholote vs White-throated Cacholote
- Caatinga Cacholote vs White-throated Cacholote
- Elegant Woodcreeper vs Ocellated Woodcreeper
- Chestnut-rumped Woodcreeper vs Ocellated Woodcreeper
- Chiriqui Foliage-gleaner vs Olive-backed Foliage-gleaner
- Olive-backed Foliage-gleaner vs Orange-fronted Plushcrown
- Orange-fronted Plushcrown vs Rusty-winged Barbtail
- Olive-backed Foliage-gleaner vs Rusty-winged Barbtail
- Black-billed Treehunter vs Striped Treehunter
- Black-billed Treehunter vs Uniform Treehunter
- Black-billed Treehunter vs Streak-breasted Treehunter
- Black-billed Treehunter vs Orange-fronted Plushcrown
- Black-billed Treehunter vs Rusty-winged Barbtail
- Black-billed Treehunter vs Flammulated Treehunter
- Flammulated Treehunter vs Streak-breasted Treehunter
- Flammulated Treehunter vs Uniform Treehunter
- Chestnut-winged Hookbill vs Flammulated Treehunter
- Band-tailed Earthcreeper vs Chestnut-winged Hookbill
- Dusky Leaftosser vs Tawny-throated Leaftosser
- Dusky Leaftosser vs Grey-throated Leaftosser
- Chestnut-winged Hookbill vs Dusky Leaftosser
- Puna Miner vs Short-billed Miner
- Coastal Miner vs Short-billed Miner
Owls
- Barred Owl vs Tawny Owl
- Burrowing Owl vs Little Owl
- Long-eared Owl vs Short-eared Owl
- Great Horned Owl vs Snowy Owl
- Burrowing Owl vs Spotted Owlet
- Little Owl vs Spotted Owlet
- Eurasian Pygmy Owl vs Ferruginous Pygmy Owl
- Boreal Owl vs Northern Saw-whet Owl
- Barred Owl vs Ural Owl
- Tawny Owl vs Ural Owl
- Eurasian Eagle-Owl vs Great Horned Owl
- Eurasian Eagle-Owl vs Snowy Owl
- Eastern Screech Owl vs Western Screech Owl
- Ferruginous Pygmy Owl vs Jungle Owlet
- Eurasian Pygmy Owl vs Jungle Owlet
- Eastern Screech Owl vs Tropical Screech Owl
- Tropical Screech Owl vs Western Screech Owl
- Ferruginous Pygmy Owl vs Northern Pygmy Owl
- Eurasian Pygmy Owl vs Northern Pygmy Owl
- Jungle Owlet vs Northern Pygmy Owl
- Northern Boobook vs Northern Hawk-Owl
- Barred Owl vs Mottled Owl
- Mottled Owl vs Tawny Owl
- Mottled Owl vs Ural Owl
- Mottled Owl vs Northern Hawk-Owl
- Asian Barred Owlet vs Jungle Owlet
- Asian Barred Owlet vs Northern Pygmy Owl
- Morepork vs Northern Boobook
- Australian Boobook vs Northern Boobook
- Australian Boobook vs Morepork
- Jungle Owlet vs Pearl-spotted Owlet
- Northern Pygmy Owl vs Pearl-spotted Owlet
- Asian Barred Owlet vs Pearl-spotted Owlet
- Northern Boobook vs Powerful Owl
- Morepork vs Powerful Owl
- Australian Boobook vs Powerful Owl
- Brown Boobook vs Powerful Owl
- Eurasian Scops Owl vs Indian Scops Owl
- Elf Owl vs Indian Scops Owl
- Brown Boobook vs Elf Owl
- Great Grey Owl vs Ural Owl
- Great Grey Owl vs Mottled Owl
- Elf Owl vs Great Grey Owl
- Black-and-white Owl vs Ural Owl
- Black-and-white Owl vs Mottled Owl
- Black-and-white Owl vs Great Grey Owl
- Black-and-white Owl vs Crested Owl
- Crested Owl vs Verreaux's Eagle-Owl
- African Scops Owl vs Eurasian Scops Owl
- African Scops Owl vs Indian Scops Owl
- African Scops Owl vs Crested Owl
- Brown Fish Owl vs Verreaux's Eagle-Owl
- Eastern Screech Owl vs Whiskered Screech Owl
- Western Screech Owl vs Whiskered Screech Owl
- Tropical Screech Owl vs Whiskered Screech Owl
- African Wood Owl vs Mottled Owl
- African Wood Owl vs Great Grey Owl
- African Wood Owl vs Black-and-white Owl
- Austral Pygmy Owl vs Pearl-spotted Owlet
- Austral Pygmy Owl vs Pacific Pygmy Owl
- Tawny-bellied Screech Owl vs Western Screech Owl
- Tawny-bellied Screech Owl vs Tropical Screech Owl
- Tawny-bellied Screech Owl vs Whiskered Screech Owl
- Short-eared Owl vs Striped Owl
- Long-eared Owl vs Striped Owl
- Indian Scops Owl vs Oriental Scops Owl
- African Scops Owl vs Oriental Scops Owl
- Flammulated Owl vs Oriental Scops Owl
- Barking Owl vs Powerful Owl
- Barking Owl vs Brown Boobook
- Barking Owl vs Flammulated Owl
- Great Grey Owl vs Mottled Wood Owl
- Black-and-white Owl vs Mottled Wood Owl
- African Wood Owl vs Mottled Wood Owl
- Flammulated Owl vs Mottled Wood Owl
- Pacific Screech Owl vs Whiskered Screech Owl
- Pacific Screech Owl vs Tawny-bellied Screech Owl
- Middle American Screech Owl vs Whiskered Screech Owl
- Middle American Screech Owl vs Tawny-bellied Screech Owl
- Middle American Screech Owl vs Pacific Screech Owl
- Short-eared Owl vs Stygian Owl
- Long-eared Owl vs Stygian Owl
- Striped Owl vs Stygian Owl
- Amazonian Pygmy Owl vs Austral Pygmy Owl
- Amazonian Pygmy Owl vs Pacific Pygmy Owl
- Cape Eagle-Owl vs Snowy Owl
- Cape Eagle-Owl vs Eurasian Eagle-Owl
- African Barred Owlet vs Austral Pygmy Owl
- African Barred Owlet vs Pacific Pygmy Owl
- African Barred Owlet vs Amazonian Pygmy Owl
- Amazonian Pygmy Owl vs Cuban Pygmy Owl
- African Barred Owlet vs Cuban Pygmy Owl
- Black-banded Owl vs Mottled Wood Owl
- Buffy Fish Owl vs Verreaux's Eagle-Owl
- Brown Fish Owl vs Buffy Fish Owl
- Marsh Owl vs Striped Owl
- Marsh Owl vs Stygian Owl
- Band-bellied Owl vs Spectacled Owl
- Amazonian Pygmy Owl vs Andean Pygmy Owl
- African Barred Owlet vs Andean Pygmy Owl
- Andean Pygmy Owl vs Cuban Pygmy Owl
- Andean Pygmy Owl vs Colima Pygmy Owl
- Andean Pygmy Owl vs Central American Pygmy Owl
- Central American Pygmy Owl vs Colima Pygmy Owl
- Central American Pygmy Owl vs Puerto Rican Owl
- Black-banded Owl vs Rufous-banded Owl
- Puerto Rican Owl vs Rufous-banded Owl
- Middle American Screech Owl vs White-throated Screech Owl
- Andean Pygmy Owl vs Cloud-forest Pygmy Owl
- Cloud-forest Pygmy Owl vs Colima Pygmy Owl
- Central American Pygmy Owl vs Cloud-forest Pygmy Owl
- Spot-bellied Eagle-Owl vs Verreaux's Eagle-Owl
- Brown Fish Owl vs Spot-bellied Eagle-Owl
- Buffy Fish Owl vs Spot-bellied Eagle-Owl
- Bare-shanked Screech Owl vs White-throated Screech Owl
- Buffy Fish Owl vs Dusky Eagle-Owl
- Dusky Eagle-Owl vs Spot-bellied Eagle-Owl
Oystercatchers
- American Oystercatcher vs Eurasian Oystercatcher
- Black Oystercatcher vs Eurasian Oystercatcher
- American Oystercatcher vs Black Oystercatcher
- Eurasian Oystercatcher vs Pied Oystercatcher
- American Oystercatcher vs Pied Oystercatcher
- Black Oystercatcher vs Pied Oystercatcher
- American Oystercatcher vs Variable Oystercatcher
- Black Oystercatcher vs Variable Oystercatcher
- Pied Oystercatcher vs Variable Oystercatcher
- Pied Oystercatcher vs Sooty Oystercatcher
- Sooty Oystercatcher vs Variable Oystercatcher
- Pied Oystercatcher vs South Island Oystercatcher
- South Island Oystercatcher vs Variable Oystercatcher
- Sooty Oystercatcher vs South Island Oystercatcher
- African Oystercatcher vs Variable Oystercatcher
- African Oystercatcher vs Sooty Oystercatcher
- African Oystercatcher vs South Island Oystercatcher
- Blackish Oystercatcher vs South Island Oystercatcher
- African Oystercatcher vs Blackish Oystercatcher
- Blackish Oystercatcher vs Magellanic Oystercatcher
- African Oystercatcher vs Magellanic Oystercatcher
- Magellanic Oystercatcher vs South Island Oystercatcher
Pardalotes
Parrotbills and Allies
Partridges, Pheasants, Grouse, and Allies
- Indian Peafowl vs Ruffed Grouse
- Grey Partridge vs Ruffed Grouse
- Grey Francolin vs Ruffed Grouse
- Chukar Partridge vs Red-legged Partridge
- Grey Junglefowl vs Red Junglefowl
- Rock Ptarmigan vs Willow Ptarmigan
- Sooty Grouse vs Spruce Grouse
- Kalij Pheasant vs Spruce Grouse
- Black Francolin vs Spruce Grouse
- Cape Spurfowl vs Red-necked Spurfowl
- Dusky Grouse vs Sooty Grouse
- Common Quail vs Stubble Quail
- Greater Prairie Chicken vs Sharp-tailed Grouse
- Cape Spurfowl vs Erckel's Spurfowl
- Erckel's Spurfowl vs Red-necked Spurfowl
- Ocellated Turkey vs Wild Turkey
- Red-legged Partridge vs Rock Partridge
- Chukar Partridge vs Rock Partridge
- Red-necked Spurfowl vs Yellow-necked Spurfowl
- Erckel's Spurfowl vs Yellow-necked Spurfowl
- Hill Partridge vs Taiwan Partridge
- Double-spurred Spurfowl vs Erckel's Spurfowl
- Double-spurred Spurfowl vs Yellow-necked Spurfowl
- Black Francolin vs Painted Francolin
- Red Junglefowl vs Sri Lanka Junglefowl
- Grey Junglefowl vs Sri Lanka Junglefowl
- White-tailed Ptarmigan vs Willow Ptarmigan
- Rock Ptarmigan vs White-tailed Ptarmigan
- Common Quail vs Rain Quail
- Rain Quail vs Stubble Quail
- Kalij Pheasant vs Swinhoe's Pheasant
- Barbary Partridge vs Red-legged Partridge
- Barbary Partridge vs Chukar Partridge
- Barbary Partridge vs Rock Partridge
- Painted Spurfowl vs Red Spurfowl
- Common Pheasant vs Green Pheasant
- Rufous-throated Partridge vs Taiwan Partridge
- Hill Partridge vs Rufous-throated Partridge
- Great Argus vs Rufous-throated Partridge
- Jungle Bush Quail vs Rock Bush Quail
- Black Francolin vs Chinese Francolin
- Chinese Francolin vs Painted Francolin
- Brown Quail vs King Quail
- Grey Francolin vs Swamp Francolin
- Green Peafowl vs Indian Peafowl
- Japanese Quail vs Stubble Quail
- Japanese Quail vs Rain Quail
- Arabian Partridge vs Chukar Partridge
- Arabian Partridge vs Rock Partridge
- Arabian Partridge vs Barbary Partridge
- Kalij Pheasant vs Silver Pheasant
- Silver Pheasant vs Swinhoe's Pheasant
Pelicans
- American White Pelican vs Brown Pelican
- Australian Pelican vs Brown Pelican
- American White Pelican vs Australian Pelican
- Brown Pelican vs Great White Pelican
- American White Pelican vs Great White Pelican
- Australian Pelican vs Great White Pelican
- Australian Pelican vs Spot-billed Pelican
- Great White Pelican vs Spot-billed Pelican
- Australian Pelican vs Peruvian Pelican
- Great White Pelican vs Peruvian Pelican
- Peruvian Pelican vs Spot-billed Pelican
- Dalmatian Pelican vs Great White Pelican
- Dalmatian Pelican vs Spot-billed Pelican
- Dalmatian Pelican vs Peruvian Pelican
- Dalmatian Pelican vs Pink-backed Pelican
- Peruvian Pelican vs Pink-backed Pelican
- Pink-backed Pelican vs Spot-billed Pelican
Penduline Tits
Penguins
- Little Penguin vs Magellanic Penguin
- King Penguin vs Little Penguin
- Humboldt Penguin vs Little Penguin
- Humboldt Penguin vs Magellanic Penguin
- African Penguin vs Magellanic Penguin
- African Penguin vs Humboldt Penguin
- Galapagos Penguin vs Magellanic Penguin
- Galapagos Penguin vs Humboldt Penguin
- African Penguin vs Galapagos Penguin
- Macaroni Penguin vs Western Rockhopper Penguin
- Western Rockhopper Penguin vs Yellow-eyed Penguin
- Macaroni Penguin vs Yellow-eyed Penguin
- Gentoo Penguin vs Yellow-eyed Penguin
Petrels, Shearwaters, and Diving Petrels
- Pink-footed Shearwater vs Sooty Shearwater
- Sooty Shearwater vs Wedge-tailed Shearwater
- Pink-footed Shearwater vs Wedge-tailed Shearwater
- Great Shearwater vs Sooty Shearwater
- Great Shearwater vs Pink-footed Shearwater
- Great Shearwater vs Wedge-tailed Shearwater
- Black-vented Shearwater vs Manx Shearwater
- Buller's Shearwater vs Great Shearwater
- Northern Giant Petrel vs Southern Giant Petrel
- Manx Shearwater vs Sargasso Shearwater
- Black-vented Shearwater vs Sargasso Shearwater
- Scopoli's Shearwater vs Streaked Shearwater
- Pintado Petrel vs Streaked Shearwater
- Pintado Petrel vs Sargasso Shearwater
- Fluttering Shearwater vs Manx Shearwater
- Black-vented Shearwater vs Fluttering Shearwater
- Fluttering Shearwater vs Sargasso Shearwater
- Fluttering Shearwater vs Pintado Petrel
- Black-vented Shearwater vs Mediterranean Shearwater
- Mediterranean Shearwater vs Sargasso Shearwater
- Fluttering Shearwater vs Mediterranean Shearwater
- Galapagos Shearwater vs Sargasso Shearwater
- Fluttering Shearwater vs Galapagos Shearwater
- Galapagos Shearwater vs Mediterranean Shearwater
- Black-capped Petrel vs Great-winged Petrel
- Hutton's Shearwater vs Mediterranean Shearwater
- Galapagos Shearwater vs Hutton's Shearwater
- Westland Petrel vs White-chinned Petrel
- Northern Fulmar vs Southern Fulmar
- Barau's Petrel vs Great-winged Petrel
- Barau's Petrel vs Black-capped Petrel
- Common Diving Petrel vs Peruvian Diving Petrel
- Barau's Petrel vs Galapagos Petrel
- Barau's Petrel vs Soft-plumaged Petrel
- Galapagos Petrel vs Soft-plumaged Petrel
- Galapagos Petrel vs White-headed Petrel
- Soft-plumaged Petrel vs White-headed Petrel
- Fairy Prion vs Slender-billed Prion
- Black Petrel vs White-chinned Petrel
- Black Petrel vs Westland Petrel
- Antarctic Prion vs Fairy Prion
- Antarctic Prion vs Slender-billed Prion
Pittas
Plovers and Lapwings
- Tibetan Sand Plover vs Two-banded Plover
- Tibetan Sand Plover vs White-fronted Plover
- Malaysian Plover vs Tibetan Sand Plover
- Siberian Sand Plover vs Two-banded Plover
- Siberian Sand Plover vs White-fronted Plover
- Malaysian Plover vs Siberian Sand Plover
- Double-banded Plover vs Two-banded Plover
- Double-banded Plover vs White-fronted Plover
- Double-banded Plover vs Malaysian Plover
- Two-banded Plover vs Wilson's Plover
- White-fronted Plover vs Wilson's Plover
- Malaysian Plover vs Wilson's Plover
- Two-banded Plover vs White-fronted Plover
- Malaysian Plover vs Two-banded Plover
- Puna Plover vs White-fronted Plover
- Malaysian Plover vs Puna Plover
- Kittlitz's Plover vs White-fronted Plover
- Kittlitz's Plover vs Malaysian Plover
- St. Helena Plover vs White-fronted Plover
- Malaysian Plover vs St. Helena Plover
- Red-capped Plover vs White-fronted Plover
- Malaysian Plover vs Red-capped Plover
- Snowy Plover vs White-fronted Plover
- Malaysian Plover vs Snowy Plover
- Malaysian Plover vs White-fronted Plover
- Killdeer vs Semipalmated Plover
- Common Ringed Plover vs Killdeer
- Common Ringed Plover vs Semipalmated Plover
- Northern Lapwing vs Southern Lapwing
- Masked Lapwing vs Northern Lapwing
- Masked Lapwing vs Southern Lapwing
- Northern Lapwing vs Red-wattled Lapwing
- Red-wattled Lapwing vs Southern Lapwing
- Masked Lapwing vs Red-wattled Lapwing
- European Golden Plover vs Grey Plover
- Blacksmith Lapwing vs Southern Lapwing
- Blacksmith Lapwing vs Masked Lapwing
- Blacksmith Lapwing vs Red-wattled Lapwing
- Grey Plover vs Pacific Golden Plover
- European Golden Plover vs Pacific Golden Plover
- Killdeer vs Piping Plover
- Piping Plover vs Semipalmated Plover
- Common Ringed Plover vs Piping Plover
- Blacksmith Lapwing vs Crowned Lapwing
- American Golden Plover vs Grey Plover
- American Golden Plover vs European Golden Plover
- American Golden Plover vs Pacific Golden Plover
- Blacksmith Lapwing vs Spur-winged Lapwing
- Crowned Lapwing vs Spur-winged Lapwing
- Greater Sand Plover vs Kentish Plover
- Spur-winged Lapwing vs Yellow-wattled Lapwing
- Red-kneed Dotterel vs Yellow-wattled Lapwing
- Eurasian Dotterel vs Red-kneed Dotterel
- Grey-headed Lapwing vs Spur-winged Lapwing
- Grey-headed Lapwing vs Yellow-wattled Lapwing
- Grey-headed Lapwing vs Red-kneed Dotterel
- Eurasian Dotterel vs Grey-headed Lapwing
- River Lapwing vs Yellow-wattled Lapwing
- Eurasian Dotterel vs River Lapwing
- Grey-headed Lapwing vs River Lapwing
- Andean Lapwing vs Yellow-wattled Lapwing
- Andean Lapwing vs Grey-headed Lapwing
- Andean Lapwing vs River Lapwing
- Hooded Plover vs Pied Plover
- Andean Lapwing vs Banded Lapwing
- Banded Lapwing vs Pied Plover
- Andean Lapwing vs White-crowned Lapwing
- Banded Lapwing vs White-crowned Lapwing
- Rufous-chested Dotterel vs White-crowned Lapwing
- Banded Lapwing vs Rufous-chested Dotterel
- Banded Lapwing vs Long-toed Lapwing
- Long-toed Lapwing vs White-crowned Lapwing
- Long-toed Lapwing vs Rufous-chested Dotterel
- Black-winged Lapwing vs Long-toed Lapwing
- Kentish Plover vs Wrybill
- Greater Sand Plover vs Wrybill
- Kentish Plover vs Oriental Plover
- Greater Sand Plover vs Oriental Plover
- Oriental Plover vs Wrybill
- Oriental Plover vs Tawny-throated Dotterel
- Caspian Plover vs Greater Sand Plover
- Caspian Plover vs Wrybill
- Caspian Plover vs Oriental Plover
Potoos
Prong-billed Barbet and Toucan Barbet
Puffbirds
- Black-fronted Nunbird vs Swallow-winged Puffbird
- Swallow-winged Puffbird vs White-whiskered Puffbird
- Swallow-winged Puffbird vs White-necked Puffbird
- Black-fronted Nunbird vs White-fronted Nunbird
- Pied Puffbird vs White-necked Puffbird
- Moustached Puffbird vs White-whiskered Puffbird
- Spot-backed Puffbird vs White-eared Puffbird
- Black-breasted Puffbird vs White-necked Puffbird
- Black-breasted Puffbird vs Pied Puffbird
- Barred Puffbird vs Spot-backed Puffbird
- Barred Puffbird vs White-eared Puffbird
- Crescent-chested Puffbird vs White-whiskered Puffbird
- Crescent-chested Puffbird vs Moustached Puffbird
- Russet-throated Puffbird vs Two-banded Puffbird
- Black-fronted Nunbird vs Black Nunbird
- Black Nunbird vs White-fronted Nunbird
- Black-fronted Nunbird vs Yellow-billed Nunbird
- White-fronted Nunbird vs Yellow-billed Nunbird
- Black Nunbird vs Yellow-billed Nunbird
- Lanceolated Monklet vs Yellow-billed Nunbird
- Lanceolated Monklet vs Spotted Puffbird
- Chestnut-capped Puffbird vs Lanceolated Monklet
- Chestnut-capped Puffbird vs Spotted Puffbird
- Spot-backed Puffbird vs Western Striolated Puffbird
- Western Striolated Puffbird vs White-eared Puffbird
- Barred Puffbird vs Western Striolated Puffbird
- Black-streaked Puffbird vs White-whiskered Puffbird
- Black-streaked Puffbird vs Moustached Puffbird
- Black-streaked Puffbird vs Crescent-chested Puffbird
Rails, Gallinules, and Coots
- American Coot vs Eurasian Coot
- Virginia Rail vs Water Rail
- Common Moorhen vs Dusky Moorhen
- Clapper Rail vs Water Rail
- Clapper Rail vs Virginia Rail
- American Coot vs Red-knobbed Coot
- Eurasian Coot vs Red-knobbed Coot
- Corn Crake vs Red-knobbed Coot
- Corn Crake vs Grey-cowled Wood Rail
- American Coot vs Red-gartered Coot
- Eurasian Coot vs Red-gartered Coot
- Red-gartered Coot vs Red-knobbed Coot
- Corn Crake vs Red-gartered Coot
- Red-knobbed Coot vs White-winged Coot
- Red-gartered Coot vs White-winged Coot
- King Rail vs Water Rail
- King Rail vs Virginia Rail
- Clapper Rail vs King Rail
- Giant Wood Rail vs Grey-cowled Wood Rail
- Grey-cowled Wood Rail vs Slaty-breasted Wood Rail
- Giant Wood Rail vs Slaty-breasted Wood Rail
- Grey-cowled Wood Rail vs Russet-naped Wood Rail
- Giant Wood Rail vs Russet-naped Wood Rail
- Russet-naped Wood Rail vs Slaty-breasted Wood Rail
- Red-fronted Coot vs Red-knobbed Coot
- Red-fronted Coot vs Red-gartered Coot
- Red-fronted Coot vs White-winged Coot
- Andean Coot vs Red-gartered Coot
- Andean Coot vs White-winged Coot
- Andean Coot vs Red-fronted Coot
- Andean Coot vs Spot-flanked Gallinule
- Ruddy Crake vs White-throated Crake
- Ruddy Crake vs Spot-flanked Gallinule
- Rufous-sided Crake vs White-throated Crake
- Ruddy Crake vs Rufous-sided Crake
- Baillon's Crake vs Black Crake
- Australian Crake vs Sora
- Black-tailed Nativehen vs Tasmanian Nativehen
- Blackish Rail vs Plumbeous Rail
- Buff-banded Rail vs Weka
- Black Crake vs Spotless Crake
- Baillon's Crake vs Spotless Crake
- Ash-throated Crake vs Watercock
- Grey-breasted Crake vs White-throated Crake
- Grey-breasted Crake vs Ruddy Crake
- Grey-breasted Crake vs Rufous-sided Crake
- African Rail vs King Rail
- Buff-banded Rail vs Lord Howe Woodhen
- Lord Howe Woodhen vs Weka
- Andean Coot vs Giant Coot
- Plumbeous Rail vs Spotted Rail
- Blackish Rail vs Spotted Rail
- Spotted Rail vs Uniform Crake
- Slaty-legged Crake vs Uniform Crake
- Brown-cheeked Rail vs King Rail
- African Rail vs Brown-cheeked Rail
- Brown-cheeked Rail vs Uniform Crake
- Giant Wood Rail vs Rufous-necked Wood Rail
- Rufous-necked Wood Rail vs Slaty-breasted Wood Rail
- Rufous-necked Wood Rail vs Russet-naped Wood Rail
- African Rail vs Bogota Rail
- Bogota Rail vs Brown-cheeked Rail
- African Crake vs Bogota Rail
- Purple Gallinule vs South Island Takahe
- African Crake vs South Island Takahe
- Allen's Gallinule vs Purple Gallinule
- African Crake vs Allen's Gallinule
- Allen's Gallinule vs South Island Takahe
- Grey-breasted Crake vs Yellow-breasted Crake
- African Rail vs Mangrove Rail
- Brown-cheeked Rail vs Mangrove Rail
- Bogota Rail vs Mangrove Rail
Reed Warblers and Allies
- Common Reed Warbler vs Sedge Warbler
- Common Reed Warbler vs Marsh Warbler
- Marsh Warbler vs Sedge Warbler
- Blyth's Reed Warbler vs Common Reed Warbler
- Blyth's Reed Warbler vs Sedge Warbler
- Blyth's Reed Warbler vs Marsh Warbler
- Great Reed Warbler vs Marsh Warbler
- Blyth's Reed Warbler vs Great Reed Warbler
- Icterine Warbler vs Melodious Warbler
- Australian Reed Warbler vs Marsh Warbler
- Australian Reed Warbler vs Blyth's Reed Warbler
- Australian Reed Warbler vs Great Reed Warbler
- Clamorous Reed Warbler vs Great Reed Warbler
- Australian Reed Warbler vs Clamorous Reed Warbler
- Australian Reed Warbler vs Lesser Swamp Warbler
- Clamorous Reed Warbler vs Lesser Swamp Warbler
- Booted Warbler vs Eastern Olivaceous Warbler
- Clamorous Reed Warbler vs Oriental Reed Warbler
- Lesser Swamp Warbler vs Oriental Reed Warbler
- Lesser Swamp Warbler vs Moustached Warbler
- Moustached Warbler vs Oriental Reed Warbler
- Eastern Olivaceous Warbler vs Sykes's Warbler
- Booted Warbler vs Sykes's Warbler
- African Yellow Warbler vs Eastern Olivaceous Warbler
- African Yellow Warbler vs Booted Warbler
- African Yellow Warbler vs Sykes's Warbler
- Icterine Warbler vs Olive-tree Warbler
- Melodious Warbler vs Olive-tree Warbler
Rhabdornis, Starlings, and Mynas
- Common Starling vs Spotless Starling
- Common Myna vs Javan Myna
- Common Myna vs Jungle Myna
- Javan Myna vs Jungle Myna
- Common Myna vs Crested Myna
- Crested Myna vs Javan Myna
- Crested Myna vs Jungle Myna
- Black-collared Starling vs Indian Pied Myna
- Brahminy Starling vs Chestnut-tailed Starling
- Cape Starling vs Pied Starling
- Pied Starling vs Rosy Starling
- Great Myna vs Javan Myna
- Great Myna vs Jungle Myna
- Crested Myna vs Great Myna
- Great Myna vs Rosy Starling
- Violet-backed Starling vs Wattled Starling
- Southern Hill Myna vs Wattled Starling
- Southern Hill Myna vs Violet-backed Starling
- Cape Starling vs Greater Blue-eared Starling
- Greater Blue-eared Starling vs Pied Starling
- Greater Blue-eared Starling vs Wattled Starling
- Greater Blue-eared Starling vs Violet-backed Starling
- Bank Myna vs Crested Myna
- Bank Myna vs Great Myna
- Pied Starling vs Superb Starling
- Greater Blue-eared Starling vs Superb Starling
- Common Hill Myna vs Southern Hill Myna
- Brahminy Starling vs White-shouldered Starling
- Chestnut-tailed Starling vs White-shouldered Starling
- Red-winged Starling vs Tristram's Starling
- Hildebrandt's Starling vs Purple Starling
- Great Myna vs Vinous-breasted Myna
- Bank Myna vs Vinous-breasted Myna
- Chestnut-bellied Starling vs Purple Starling
Rheas
Rollers
- European Roller vs Indian Roller
- Indian Roller vs Lilac-breasted Roller
- European Roller vs Lilac-breasted Roller
- Indian Roller vs Indochinese Roller
- European Roller vs Indochinese Roller
- Indochinese Roller vs Lilac-breasted Roller
- Broad-billed Roller vs Oriental Dollarbird
- Indochinese Roller vs Purple Roller
- Abyssinian Roller vs Indochinese Roller
- Abyssinian Roller vs Purple Roller
- Blue-bellied Roller vs Indochinese Roller
- Blue-bellied Roller vs Purple Roller
- Abyssinian Roller vs Blue-bellied Roller
Royal Flycatchers and Allies
Sandgrouse
- Black-bellied Sandgrouse vs Chestnut-bellied Sandgrouse
- Chestnut-bellied Sandgrouse vs Pin-tailed Sandgrouse
- Black-bellied Sandgrouse vs Pin-tailed Sandgrouse
- Chestnut-bellied Sandgrouse vs Namaqua Sandgrouse
- Black-bellied Sandgrouse vs Namaqua Sandgrouse
- Namaqua Sandgrouse vs Pin-tailed Sandgrouse
- Double-banded Sandgrouse vs Pin-tailed Sandgrouse
- Double-banded Sandgrouse vs Namaqua Sandgrouse
- Black-bellied Sandgrouse vs Double-banded Sandgrouse
- Black-faced Sandgrouse vs Burchell's Sandgrouse
- Black-faced Sandgrouse vs Spotted Sandgrouse
- Burchell's Sandgrouse vs Spotted Sandgrouse
- Black-faced Sandgrouse vs Lichtenstein's Sandgrouse
- Burchell's Sandgrouse vs Lichtenstein's Sandgrouse
- Lichtenstein's Sandgrouse vs Spotted Sandgrouse
- Painted Sandgrouse vs Spotted Sandgrouse
- Lichtenstein's Sandgrouse vs Painted Sandgrouse
- Spotted Sandgrouse vs Yellow-throated Sandgrouse
- Lichtenstein's Sandgrouse vs Yellow-throated Sandgrouse
- Painted Sandgrouse vs Yellow-throated Sandgrouse
Sandpipers and Allies
- Dunlin vs Least Sandpiper
- Common Sandpiper vs Spotted Sandpiper
- Greater Yellowlegs vs Lesser Yellowlegs
- Greater Yellowlegs vs Willet
- Lesser Yellowlegs vs Willet
- Dunlin vs Sanderling
- Least Sandpiper vs Sanderling
- Common Redshank vs Greater Yellowlegs
- Common Redshank vs Lesser Yellowlegs
- Common Redshank vs Willet
- Common Greenshank vs Lesser Yellowlegs
- Common Greenshank vs Willet
- Common Greenshank vs Common Redshank
- Common Snipe vs Wilson's Snipe
- Eurasian Curlew vs Eurasian Whimbrel
- Common Greenshank vs Wood Sandpiper
- Green Sandpiper vs Wood Sandpiper
- Common Greenshank vs Green Sandpiper
- Dunlin vs Semipalmated Sandpiper
- Least Sandpiper vs Semipalmated Sandpiper
- Sanderling vs Semipalmated Sandpiper
- Solitary Sandpiper vs Wood Sandpiper
- Green Sandpiper vs Solitary Sandpiper
- Common Greenshank vs Solitary Sandpiper
- Ruff vs Sanderling
- Ruff vs Semipalmated Sandpiper
- Semipalmated Sandpiper vs Western Sandpiper
- Ruff vs Western Sandpiper
- Pectoral Sandpiper vs Semipalmated Sandpiper
- Pectoral Sandpiper vs Ruff
- Pectoral Sandpiper vs Western Sandpiper
- Long-billed Dowitcher vs Short-billed Dowitcher
- Black-tailed Godwit vs Marbled Godwit
- Bar-tailed Godwit vs Marbled Godwit
- Bar-tailed Godwit vs Black-tailed Godwit
- Eurasian Curlew vs Long-billed Curlew
- Eurasian Whimbrel vs Long-billed Curlew
- Red-necked Phalarope vs Wilson's Phalarope
- Curlew Sandpiper vs Little Stint
- American Woodcock vs Eurasian Woodcock
- Little Stint vs Stilt Sandpiper
- Curlew Sandpiper vs Stilt Sandpiper
- Baird's Sandpiper vs Curlew Sandpiper
- Baird's Sandpiper vs Stilt Sandpiper
- Stilt Sandpiper vs White-rumped Sandpiper
- Baird's Sandpiper vs White-rumped Sandpiper
- Black Turnstone vs Ruddy Turnstone
- Marsh Sandpiper vs Spotted Redshank
- Stilt Sandpiper vs Temminck's Stint
- Baird's Sandpiper vs Temminck's Stint
- Temminck's Stint vs White-rumped Sandpiper
- Purple Sandpiper vs White-rumped Sandpiper
- Purple Sandpiper vs Temminck's Stint
- Purple Sandpiper vs Red-necked Stint
- Red-necked Stint vs Temminck's Stint
- Red-necked Stint vs Upland Sandpiper
- Red-necked Phalarope vs Red Phalarope
- Red Phalarope vs Wilson's Phalarope
- Red Phalarope vs Upland Sandpiper
- Red-necked Stint vs Sharp-tailed Sandpiper
- Sharp-tailed Sandpiper vs Upland Sandpiper
- Hudsonian Godwit vs Marbled Godwit
- Black-tailed Godwit vs Hudsonian Godwit
- Bar-tailed Godwit vs Hudsonian Godwit
- Hudsonian Godwit vs Jack Snipe
- Jack Snipe vs Sharp-tailed Sandpiper
- Spotted Redshank vs Wandering Tattler
- Marsh Sandpiper vs Wandering Tattler
- Jack Snipe vs Wandering Tattler
- Sharp-tailed Sandpiper vs Surfbird
- Surfbird vs Terek Sandpiper
- Broad-billed Sandpiper vs Sharp-tailed Sandpiper
- Broad-billed Sandpiper vs Surfbird
- Broad-billed Sandpiper vs Terek Sandpiper
- Grey-tailed Tattler vs Spotted Redshank
- Grey-tailed Tattler vs Marsh Sandpiper
- Grey-tailed Tattler vs Wandering Tattler
- Buff-breasted Sandpiper vs Sharp-tailed Sandpiper
- Buff-breasted Sandpiper vs Surfbird
- Broad-billed Sandpiper vs Buff-breasted Sandpiper
- Buff-breasted Sandpiper vs Long-toed Stint
- Common Snipe vs Latham's Snipe
- Latham's Snipe vs Wilson's Snipe
- Long-toed Stint vs Rock Sandpiper
- Common Snipe vs Great Snipe
- Great Snipe vs Wilson's Snipe
- Great Snipe vs Latham's Snipe
- African Snipe vs Latham's Snipe
- African Snipe vs Great Snipe
- Latham's Snipe vs Pin-tailed Snipe
- Great Snipe vs Pin-tailed Snipe
- African Snipe vs Pin-tailed Snipe
- Great Snipe vs Pantanal Snipe
- African Snipe vs Pantanal Snipe
- Pantanal Snipe vs Pin-tailed Snipe
- Magellanic Snipe vs Pantanal Snipe
- Magellanic Snipe vs Pin-tailed Snipe
- African Snipe vs Magellanic Snipe
- Asian Dowitcher vs Long-billed Dowitcher
- Asian Dowitcher vs Short-billed Dowitcher
- Little Curlew vs Long-billed Curlew
- Bristle-thighed Curlew vs Long-billed Curlew
- Bristle-thighed Curlew vs Little Curlew
- Nordmann's Greenshank vs Wandering Tattler
- Grey-tailed Tattler vs Nordmann's Greenshank
- Marsh Sandpiper vs Nordmann's Greenshank
- Rock Sandpiper vs Spoon-billed Sandpiper
- Long-toed Stint vs Spoon-billed Sandpiper
- Noble Snipe vs Swinhoe's Snipe
- Hudsonian Whimbrel vs Little Curlew
- Bristle-thighed Curlew vs Hudsonian Whimbrel
Screamers
Seedsnipes
Seriemas
Shrike-babblers, Erpornis, and Vireos
- Red-eyed Vireo vs White-eyed Vireo
- Blue-headed Vireo vs Red-eyed Vireo
- Blue-headed Vireo vs White-eyed Vireo
- White-eyed Vireo vs Yellow-throated Vireo
- Blue-headed Vireo vs Yellow-throated Vireo
- Blue-headed Vireo vs Hutton's Vireo
- Hutton's Vireo vs Yellow-throated Vireo
- Bell's Vireo vs Yellow-throated Vireo
- Bell's Vireo vs Hutton's Vireo
- Hutton's Vireo vs Philadelphia Vireo
- Bell's Vireo vs Philadelphia Vireo
- Cassin's Vireo vs Hutton's Vireo
- Bell's Vireo vs Cassin's Vireo
- Cassin's Vireo vs Philadelphia Vireo
- Bell's Vireo vs Plumbeous Vireo
- Philadelphia Vireo vs Plumbeous Vireo
- Cassin's Vireo vs Plumbeous Vireo
- Plumbeous Vireo vs Yellow-green Vireo
- Brown-capped Vireo vs Yellow-green Vireo
- Black-whiskered Vireo vs Yellow-green Vireo
- Black-whiskered Vireo vs Brown-capped Vireo
- Black-whiskered Vireo vs White-bellied Erpornis
- Brown-capped Vireo vs White-bellied Erpornis
- Mangrove Vireo vs Yellow-green Vireo
- Brown-capped Vireo vs Mangrove Vireo
- Black-whiskered Vireo vs Mangrove Vireo
- Black-billed Peppershrike vs Rufous-browed Peppershrike
- Golden-fronted Greenlet vs Lesser Greenlet
- Black-capped Vireo vs Mangrove Vireo
- Grey Vireo vs Mangrove Vireo
- Black-capped Vireo vs Grey Vireo
- Lesser Greenlet vs Rufous-naped Greenlet
- Golden-fronted Greenlet vs Rufous-naped Greenlet
- Black-capped Vireo vs Yucatan Vireo
- Grey Vireo vs Yucatan Vireo
- Black-capped Vireo vs Golden Vireo
- Golden Vireo vs Grey Vireo
- Golden Vireo vs Yucatan Vireo
- Thick-billed Vireo vs Yucatan Vireo
- Golden Vireo vs Thick-billed Vireo
- Golden Vireo vs Yellow-winged Vireo
- Thick-billed Vireo vs Yellow-winged Vireo
- Yellow-winged Vireo vs Yucatan Vireo
- Lemon-chested Greenlet vs Rufous-crowned Greenlet
- Ashy-headed Greenlet vs Rufous-crowned Greenlet
- Ashy-headed Greenlet vs Lemon-chested Greenlet
- Grey-eyed Greenlet vs Rufous-crowned Greenlet
- Grey-eyed Greenlet vs Lemon-chested Greenlet
- Ashy-headed Greenlet vs Grey-eyed Greenlet
- Chestnut-sided Shrike-Vireo vs Green Shrike-Vireo
- Grey-chested Greenlet vs Lemon-chested Greenlet
- Ashy-headed Greenlet vs Grey-chested Greenlet
- Grey-chested Greenlet vs Grey-eyed Greenlet
- Grey-chested Greenlet vs Olivaceous Greenlet
- Grey-eyed Greenlet vs Olivaceous Greenlet
- Ashy-headed Greenlet vs Olivaceous Greenlet
- Buff-cheeked Greenlet vs Golden-fronted Greenlet
- Buff-cheeked Greenlet vs Rufous-naped Greenlet
- Green Shrike-babbler vs White-browed Shrike-babbler
Shrikes
- Loggerhead Shrike vs Red-backed Shrike
- Great Grey Shrike vs Loggerhead Shrike
- Great Grey Shrike vs Red-backed Shrike
- Brown Shrike vs Loggerhead Shrike
- Brown Shrike vs Red-backed Shrike
- Brown Shrike vs Great Grey Shrike
- Long-tailed Shrike vs Red-backed Shrike
- Great Grey Shrike vs Long-tailed Shrike
- Brown Shrike vs Long-tailed Shrike
- Great Grey Shrike vs Southern Fiscal
- Brown Shrike vs Southern Fiscal
- Long-tailed Shrike vs Southern Fiscal
- Northern Shrike vs Southern Fiscal
- Long-tailed Shrike vs Northern Shrike
- Northern Shrike vs Woodchat Shrike
- Iberian Grey Shrike vs Woodchat Shrike
- Iberian Grey Shrike vs Lesser Grey Shrike
- Isabelline Shrike vs Lesser Grey Shrike
- Isabelline Shrike vs Masked Shrike
- Grey-backed Shrike vs Isabelline Shrike
- Grey-backed Shrike vs Masked Shrike
- Grey-backed Shrike vs Northern Fiscal
- Masked Shrike vs Northern Fiscal
- Isabelline Shrike vs Northern Fiscal
- Northern White-crowned Shrike vs Southern White-crowned Shrike
- Grey-backed Fiscal vs Red-tailed Shrike
- Grey-backed Fiscal vs Long-tailed Fiscal
- Long-tailed Fiscal vs Red-tailed Shrike
- Long-tailed Fiscal vs Yellow-billed Shrike
- Tiger Shrike vs Yellow-billed Shrike
- Long-tailed Fiscal vs Tiger Shrike
- Long-tailed Fiscal vs Taita Fiscal
- Taita Fiscal vs Tiger Shrike
- Mackinnon's Shrike vs Tiger Shrike
- Mackinnon's Shrike vs Taita Fiscal
Silky-flycatchers
Skimmers, Noddies, Terns, and Gulls
- American Herring Gull vs Ring-billed Gull
- Lesser Black-backed Gull vs Ring-billed Gull
- American Herring Gull vs Lesser Black-backed Gull
- European Herring Gull vs Ring-billed Gull
- American Herring Gull vs European Herring Gull
- European Herring Gull vs Lesser Black-backed Gull
- American Herring Gull vs Great Black-backed Gull
- Great Black-backed Gull vs Lesser Black-backed Gull
- European Herring Gull vs Great Black-backed Gull
- Common Gull vs Great Black-backed Gull
- Caspian Tern vs Common Tern
- Caspian Tern vs Common Gull
- California Gull vs Common Gull
- California Gull vs Caspian Tern
- Common Tern vs Forster's Tern
- Common Gull vs Yellow-legged Gull
- California Gull vs Yellow-legged Gull
- California Gull vs Glaucous-winged Gull
- Glaucous-winged Gull vs Yellow-legged Gull
- Black-headed Gull vs Bonaparte's Gull
- Royal Tern vs Sandwich Tern
- Kelp Gull vs Short-billed Gull
- Franklin's Gull vs Laughing Gull
- Black Tern vs Whiskered Tern
- Iceland Gull vs Kelp Gull
- Iceland Gull vs Short-billed Gull
- Heermann's Gull vs Kelp Gull
- Heermann's Gull vs Short-billed Gull
- Heermann's Gull vs Iceland Gull
- Greater Crested Tern vs Royal Tern
- Greater Crested Tern vs Sandwich Tern
- Little Gull vs Little Tern
- Greater Crested Tern vs Little Gull
- Glaucous Gull vs Iceland Gull
- Glaucous Gull vs Heermann's Gull
- Glaucous Gull vs Little Gull
- Elegant Tern vs Royal Tern
- Elegant Tern vs Sandwich Tern
- Elegant Tern vs Greater Crested Tern
- Caspian Gull vs Glaucous Gull
- Black-headed Gull vs Brown-hooded Gull
- Bonaparte's Gull vs Brown-hooded Gull
- Black Tern vs White-winged Tern
- Whiskered Tern vs White-winged Tern
- Bonaparte's Gull vs Slender-billed Gull
- Brown-hooded Gull vs Slender-billed Gull
- Brown-hooded Gull vs Grey-headed Gull
- Grey-headed Gull vs Slender-billed Gull
- Grey-headed Gull vs Sabine's Gull
- Sabine's Gull vs Slender-billed Gull
- Common Tern vs River Tern
- Forster's Tern vs River Tern
- River Tern vs Sabine's Gull
- Caspian Gull vs Pacific Gull
- River Tern vs Roseate Tern
- Large-billed Tern vs Roseate Tern
- River Tern vs White-fronted Tern
- Large-billed Tern vs White-fronted Tern
- Roseate Tern vs White-fronted Tern
- Brown-hooded Gull vs Hartlaub's Gull
- Hartlaub's Gull vs Slender-billed Gull
- Grey-headed Gull vs Hartlaub's Gull
- Hartlaub's Gull vs Large-billed Tern
- Black-tailed Gull vs Caspian Gull
- Black-tailed Gull vs Pacific Gull
- Andean Gull vs Hartlaub's Gull
- Australian Tern vs Gull-billed Tern
- River Tern vs South American Tern
- Roseate Tern vs South American Tern
- South American Tern vs White-fronted Tern
- Greater Crested Tern vs Lesser Crested Tern
- Elegant Tern vs Lesser Crested Tern
- Bridled Tern vs Sooty Tern
- Grey Gull vs Laughing Gull
- Franklin's Gull vs Grey Gull
- Little Tern vs Yellow-billed Tern
- Black-billed Gull vs Hartlaub's Gull
- Andean Gull vs Black-billed Gull
- Mediterranean Gull vs Pallas's Gull
- Armenian Gull vs Pacific Gull
- Armenian Gull vs Black-tailed Gull
- Snowy-crowned Tern vs White-fronted Tern
- Snowy-crowned Tern vs South American Tern
- Belcher's Gull vs Pacific Gull
- Belcher's Gull vs Black-tailed Gull
- Armenian Gull vs Belcher's Gull
- Belcher's Gull vs Inca Tern
- Inca Tern vs Snowy-crowned Tern
- Black-tailed Gull vs Slaty-backed Gull
- Armenian Gull vs Slaty-backed Gull
- Belcher's Gull vs Slaty-backed Gull
- Inca Tern vs Slaty-backed Gull
- Black Noddy vs Brown Noddy
- Black-naped Tern vs Snowy-crowned Tern
- Armenian Gull vs Yellow-footed Gull
- Belcher's Gull vs Yellow-footed Gull
- Slaty-backed Gull vs Yellow-footed Gull
- Vega Gull vs Yellow-footed Gull
- Slaty-backed Gull vs Vega Gull
- Belcher's Gull vs Vega Gull
- Black-fronted Tern vs Black Tern
- Black-fronted Tern vs Whiskered Tern
- Black-fronted Tern vs White-winged Tern
- Fairy Tern vs Little Tern
- Fairy Tern vs Yellow-billed Tern
- Saunders's Gull vs Swallow-tailed Gull
- Aleutian Tern vs Bridled Tern
- Aleutian Tern vs Sooty Tern
- Aleutian Tern vs Saunders's Gull
- Aleutian Tern vs Swallow-tailed Gull
- Franklin's Gull vs Lava Gull
- Grey Gull vs Lava Gull
- African Skimmer vs Black Skimmer
- Black-legged Kittiwake vs Red-legged Kittiwake
- Ivory Gull vs Ross's Gull
- Antarctic Tern vs Black-naped Tern
- Antarctic Tern vs Ross's Gull
- Antarctic Tern vs Ivory Gull
- Peruvian Tern vs Yellow-billed Tern
- Fairy Tern vs Peruvian Tern
- Greater Crested Tern vs West African Crested Tern
- Elegant Tern vs West African Crested Tern
- Lesser Crested Tern vs West African Crested Tern
- Olrog's Gull vs Vega Gull
- Olrog's Gull vs Yellow-footed Gull
- Damara Tern vs Yellow-billed Tern
- Damara Tern vs Fairy Tern
- Damara Tern vs Peruvian Tern
Snowfinches and Old World Sparrows
- Eurasian Tree Sparrow vs House Sparrow
- Cape Sparrow vs House Sparrow
- Cape Sparrow vs Eurasian Tree Sparrow
- Eurasian Tree Sparrow vs Spanish Sparrow
- Cape Sparrow vs Spanish Sparrow
- Rock Sparrow vs Yellow-throated Sparrow
- Italian Sparrow vs Rock Sparrow
- Italian Sparrow vs Russet Sparrow
- Sahel Bush Sparrow vs Yellow-throated Sparrow
- Chestnut Sparrow vs Swainson's Sparrow
- Chestnut Sparrow vs Sudan Golden Sparrow
Southern Storm Petrels
Spiderhunters and Sunbirds
- Purple Sunbird vs Southern Double-collared Sunbird
- Loten's Sunbird vs Southern Double-collared Sunbird
- Palestine Sunbird vs Southern Double-collared Sunbird
- Loten's Sunbird vs Palestine Sunbird
- Crimson-backed Sunbird vs Purple-rumped Sunbird
- Little Spiderhunter vs Streaked Spiderhunter
- Bronze Sunbird vs Malachite Sunbird
- Bronze Sunbird vs Orange-breasted Sunbird
- Beautiful Sunbird vs Garden Sunbird
- Garden Sunbird vs Orange-breasted Sunbird
- Copper Sunbird vs Souimanga Sunbird
- Copper Sunbird vs Olive-bellied Sunbird
- Olive-bellied Sunbird vs Souimanga Sunbird
- Northern Double-collared Sunbird vs Olive-bellied Sunbird
- Black Sunbird vs Purple-rumped Sunbird
- Black Sunbird vs Crimson-backed Sunbird
- Copper-throated Sunbird vs Purple-rumped Sunbird
- Copper-throated Sunbird vs Crimson-backed Sunbird
- Black Sunbird vs Copper-throated Sunbird
Spindalises
Stilts and Avocets
- Black-necked Stilt vs Black-winged Stilt
- American Avocet vs Pied Avocet
- Black-necked Stilt vs Pied Stilt
- Black-winged Stilt vs Pied Stilt
- American Avocet vs Red-necked Avocet
- Pied Avocet vs Red-necked Avocet
- Banded Stilt vs Red-necked Avocet
- American Avocet vs Andean Avocet
- Andean Avocet vs Pied Avocet
- Andean Avocet vs Red-necked Avocet
- Andean Avocet vs Banded Stilt
Storks
- Black Stork vs White Stork
- Painted Stork vs Wood Stork
- Asian Woolly-necked Stork vs White Stork
- Asian Woolly-necked Stork vs Black Stork
- Wood Stork vs Yellow-billed Stork
- Painted Stork vs Yellow-billed Stork
- Maguari Stork vs White Stork
- Black Stork vs Maguari Stork
- Asian Woolly-necked Stork vs Maguari Stork
- Jabiru vs Maguari Stork
- Jabiru vs Marabou Stork
- African Openbill vs Asian Openbill
- African Openbill vs Jabiru
- Black-necked Stork vs Saddle-billed Stork
- Lesser Adjutant vs Marabou Stork
- African Woolly-necked Stork vs Black Stork
- African Woolly-necked Stork vs Asian Woolly-necked Stork
- African Woolly-necked Stork vs Maguari Stork
- Abdim's Stork vs Asian Woolly-necked Stork
- Abdim's Stork vs Maguari Stork
- Abdim's Stork vs African Woolly-necked Stork
- African Woolly-necked Stork vs Oriental Stork
- Abdim's Stork vs Oriental Stork
- Greater Adjutant vs Marabou Stork
- Greater Adjutant vs Lesser Adjutant
Sugarbirds
Swallows
- Tree Swallow vs Violet-green Swallow
- Barn Swallow vs Welcome Swallow
- Grey-breasted Martin vs Purple Martin
- Barn Swallow vs Pacific Swallow
- Pacific Swallow vs Welcome Swallow
- Northern Rough-winged Swallow vs Southern Rough-winged Swallow
- Brown-throated Martin vs Sand Martin
- Barn Swallow vs Wire-tailed Swallow
- Welcome Swallow vs Wire-tailed Swallow
- Pacific Swallow vs Wire-tailed Swallow
- American Cliff Swallow vs Tree Martin
- Eastern Red-rumped Swallow vs Greater Striped Swallow
- Chilean Swallow vs Tree Swallow
- Chilean Swallow vs Violet-green Swallow
- Eastern Red-rumped Swallow vs Lesser Striped Swallow
- Greater Striped Swallow vs Lesser Striped Swallow
- Eurasian Crag Martin vs Large Rock Martin
- Mangrove Swallow vs Tree Swallow
- Mangrove Swallow vs Violet-green Swallow
- Chilean Swallow vs Mangrove Swallow
- Brown-chested Martin vs Purple Martin
- Brown-chested Martin vs Grey-breasted Martin
- American Cliff Swallow vs Cave Swallow
- Cave Swallow vs Tree Martin
- American Cliff Swallow vs Fairy Martin
- Fairy Martin vs Tree Martin
- Cave Swallow vs Fairy Martin
- Welcome Swallow vs White-throated Swallow
- Pacific Swallow vs White-throated Swallow
- White-throated Swallow vs Wire-tailed Swallow
- Violet-green Swallow vs White-winged Swallow
- Chilean Swallow vs White-winged Swallow
- Mangrove Swallow vs White-winged Swallow
- Dusky Crag Martin vs Eurasian Crag Martin
- Dusky Crag Martin vs Large Rock Martin
- Chilean Swallow vs White-rumped Swallow
- Mangrove Swallow vs White-rumped Swallow
- White-rumped Swallow vs White-winged Swallow
- Eurasian Crag Martin vs Pale Crag Martin
- Large Rock Martin vs Pale Crag Martin
- Dusky Crag Martin vs Pale Crag Martin
- Eastern Red-rumped Swallow vs Red-breasted Swallow
- Greater Striped Swallow vs Red-breasted Swallow
- Lesser Striped Swallow vs Red-breasted Swallow
- Pacific Swallow vs Pearl-breasted Swallow
- Pearl-breasted Swallow vs Wire-tailed Swallow
- Pearl-breasted Swallow vs White-throated Swallow
- Asian House Martin vs Western House Martin
- Banded Martin vs White-banded Swallow
- Asian House Martin vs Banded Martin
- Banded Martin vs Streak-throated Swallow
- Purple Martin vs Southern Martin
- Grey-breasted Martin vs Southern Martin
- Brown-chested Martin vs Southern Martin
- Caribbean Martin vs Grey-breasted Martin
- Brown-chested Martin vs Caribbean Martin
- Caribbean Martin vs Southern Martin
- Tahiti Swallow vs White-throated Swallow
- Pearl-breasted Swallow vs Tahiti Swallow
- Greater Striped Swallow vs Mosque Swallow
- Lesser Striped Swallow vs Mosque Swallow
- Mosque Swallow vs Red-breasted Swallow
- White-banded Swallow vs White-thighed Swallow
- White-backed Swallow vs White-thighed Swallow
- Black-capped Swallow vs White-banded Swallow
- Black-capped Swallow vs White-thighed Swallow
- Black-capped Swallow vs White-backed Swallow
- Tawny-headed Swallow vs White-backed Swallow
- Black-capped Swallow vs Tawny-headed Swallow
- Red-breasted Swallow vs Sri Lanka Swallow
- Mosque Swallow vs Sri Lanka Swallow
- Sri Lanka Swallow vs Tawny-headed Swallow
- Angola Swallow vs Pearl-breasted Swallow
- Angola Swallow vs Tahiti Swallow
- Andean Swallow vs Brown-bellied Swallow
- Andean Swallow vs Mascarene Martin
- Nepal House Martin vs Western House Martin
- Asian House Martin vs Nepal House Martin
- Mascarene Martin vs Nepal House Martin
- Brown-chested Martin vs Cuban Martin
- Cuban Martin vs Southern Martin
- Caribbean Martin vs Cuban Martin
- Black Saw-wing vs Fanti Saw-wing
Swifts
- Common Swift vs Little Swift
- Chimney Swift vs Vaux's Swift
- Common Swift vs House Swift
- House Swift vs Little Swift
- Common Swift vs White-rumped Swift
- Little Swift vs White-rumped Swift
- House Swift vs White-rumped Swift
- Little Swift vs Pallid Swift
- House Swift vs Pallid Swift
- Pallid Swift vs White-rumped Swift
- Chimney Swift vs Grey-rumped Swift
- Grey-rumped Swift vs Vaux's Swift
- Chimney Swift vs Sick's Swift
- Sick's Swift vs Vaux's Swift
- Grey-rumped Swift vs Sick's Swift
- Short-tailed Swift vs Vaux's Swift
- Grey-rumped Swift vs Short-tailed Swift
- Short-tailed Swift vs Sick's Swift
- Chestnut-collared Swift vs White-collared Swift
- Fork-tailed Swift vs House Swift
- Fork-tailed Swift vs White-rumped Swift
- Fork-tailed Swift vs Pallid Swift
- African Black Swift vs Fork-tailed Swift
- Antillean Palm Swift vs Fork-tailed Palm Swift
- Australian Swiftlet vs Edible-nest Swiftlet
- Band-rumped Swift vs Grey-rumped Swift
- Band-rumped Swift vs Sick's Swift
- Band-rumped Swift vs Short-tailed Swift
- Glossy Swiftlet vs Plume-toed Swiftlet
- Edible-nest Swiftlet vs Himalayan Swiftlet
- Australian Swiftlet vs Himalayan Swiftlet
- Linchi Swiftlet vs Plume-toed Swiftlet
- Glossy Swiftlet vs Linchi Swiftlet
- Andean Swift vs White-throated Swift
- Grey-rumped Swiftlet vs Plume-toed Swiftlet
- Glossy Swiftlet vs Grey-rumped Swiftlet
- Grey-rumped Swiftlet vs Linchi Swiftlet
- Fork-tailed Swift vs Horus Swift
- African Black Swift vs Horus Swift
- Band-rumped Swift vs Costa Rican Swift
- White-throated Swift vs White-tipped Swift
- Andean Swift vs White-tipped Swift
- Australian Swiftlet vs Uniform Swiftlet
- Himalayan Swiftlet vs Uniform Swiftlet
- American Black Swift vs Great Dusky Swift
- Horus Swift vs Nyanza Swift
- Band-rumped Swift vs Pale-rumped Swift
- Costa Rican Swift vs Pale-rumped Swift
Sylviid Warblers and Allies
Tanagers and Allies
- Bananaquit vs Blue-grey Tanager
- Blue-grey Tanager vs Palm Tanager
- Bananaquit vs Palm Tanager
- Bananaquit vs Saffron Finch
- Blue-black Grassquit vs Yellow-faced Grassquit
- Scarlet-rumped Tanager vs Yellow-faced Grassquit
- Variable Seedeater vs Yellow-faced Grassquit
- Green Honeycreeper vs Red-legged Honeycreeper
- Flame-rumped Tanager vs Scarlet-rumped Tanager
- Bay-headed Tanager vs Silver-throated Tanager
- Double-collared Seedeater vs Variable Seedeater
- Bluish-grey Saltator vs Swallow Tanager
- Masked Flowerpiercer vs Swallow Tanager
- Ruby-crowned Tanager vs White-lined Tanager
- Bluish-grey Saltator vs Olive-grey Saltator
- Bluish-grey Saltator vs Green-winged Saltator
- Green-winged Saltator vs Olive-grey Saltator
- Black-capped Tanager vs Burnished-buff Tanager
- Bay-headed Tanager vs Beryl-spangled Tanager
- Beryl-spangled Tanager vs Silver-throated Tanager
- Masked Flowerpiercer vs White-sided Flowerpiercer
- Crimson-collared Tanager vs Flame-rumped Tanager
- Black Flowerpiercer vs Masked Flowerpiercer
- Black Flowerpiercer vs White-sided Flowerpiercer
- Purple Honeycreeper vs Red-legged Honeycreeper
- Blue Dacnis vs Scarlet-thighed Dacnis
- Blue-and-black Tanager vs Fawn-breasted Tanager
- Blue-and-black Tanager vs Saffron-crowned Tanager
- Fawn-breasted Tanager vs Saffron-crowned Tanager
- Blue-and-black Tanager vs Turquoise Tanager
- Saffron-crowned Tanager vs Turquoise Tanager
- Red-capped Cardinal vs Red-crested Cardinal
- Flame-faced Tanager vs Turquoise Tanager
- Emerald Tanager vs Flame-faced Tanager
- Emerald Tanager vs Red-necked Tanager
- Diademed Tanager vs Puerto Rican Bullfinch
- Grey Pileated Finch vs Red Pileated Finch
- Diademed Tanager vs Grey Pileated Finch
- Orange-headed Tanager vs Superciliaried Hemispingus
- Diademed Tanager vs Superciliaried Hemispingus
- Guira Tanager vs Yellow-backed Tanager
- Medium Ground Finch vs Small Ground Finch
- Bicolored Conebill vs Blue-backed Conebill
- Spotted Tanager vs Yellow-bellied Tanager
- Bicolored Conebill vs White-eared Conebill
- Gold-ringed Tanager vs Moss-backed Tanager
- Large Ground Finch vs Small Ground Finch
- Large Ground Finch vs Medium Ground Finch
- Black-and-yellow Tanager vs Scarlet-and-white Tanager
- Rufous-crested Tanager vs Shrike-like Tanager
- Scarlet-and-white Tanager vs Shrike-like Tanager
Tapaculos
- Blackish Tapaculo vs Spillmann's Tapaculo
- Blackish Tapaculo vs Magellanic Tapaculo
- Magellanic Tapaculo vs Spillmann's Tapaculo
- Magellanic Tapaculo vs Silvery-fronted Tapaculo
- Dusky Tapaculo vs Silvery-fronted Tapaculo
- Silvery-fronted Tapaculo vs White-crowned Tapaculo
- Dusky Tapaculo vs White-crowned Tapaculo
- Ocellated Tapaculo vs White-crowned Tapaculo
- Pale-bellied Tapaculo vs White-crowned Tapaculo
- Ocellated Tapaculo vs Pale-bellied Tapaculo
- Dusky Tapaculo vs Pale-bellied Tapaculo
- Crested Gallito vs Pale-bellied Tapaculo
- Crested Gallito vs White-breasted Tapaculo
- Crested Gallito vs Ochre-flanked Tapaculo
- Ochre-flanked Tapaculo vs White-breasted Tapaculo
- Chucao Tapaculo vs White-throated Tapaculo
- Paramo Tapaculo vs Rusty-belted Tapaculo
- Choco Tapaculo vs Paramo Tapaculo
- Choco Tapaculo vs Rusty-belted Tapaculo
- Choco Tapaculo vs Tatama Tapaculo
- Santa Marta Tapaculo vs Tatama Tapaculo
Thick-knees and Stone-curlews
- Double-striped Thick-knee vs Peruvian Thick-knee
- Eurasian Stone-curlew vs Spotted Thick-knee
- Eurasian Stone-curlew vs Water Thick-knee
- Spotted Thick-knee vs Water Thick-knee
- Bush Stone-curlew vs Eurasian Stone-curlew
- Bush Stone-curlew vs Spotted Thick-knee
- Bush Stone-curlew vs Water Thick-knee
- Indian Stone-curlew vs Water Thick-knee
- Bush Stone-curlew vs Indian Stone-curlew
- Beach Stone-curlew vs Great Stone-curlew
- Indian Stone-curlew vs Senegal Thick-knee
- Bush Stone-curlew vs Senegal Thick-knee
- Senegal Thick-knee vs Water Thick-knee
Thrushes and Allies
- American Robin vs Common Blackbird
- American Robin vs Song Thrush
- Common Blackbird vs Song Thrush
- Hermit Thrush vs Swainson's Thrush
- American Robin vs Fieldfare
- Common Blackbird vs Fieldfare
- Fieldfare vs Song Thrush
- Fieldfare vs Wood Thrush
- Swainson's Thrush vs Wood Thrush
- Common Blackbird vs Redwing
- Redwing vs Song Thrush
- Fieldfare vs Redwing
- Redwing vs Wood Thrush
- Eastern Bluebird vs Western Bluebird
- Hermit Thrush vs Veery
- Swainson's Thrush vs Veery
- Mistle Thrush vs Song Thrush
- Fieldfare vs Mistle Thrush
- Mistle Thrush vs Redwing
- Clay-colored Thrush vs Redwing
- Clay-colored Thrush vs Mistle Thrush
- Eastern Bluebird vs Mountain Bluebird
- Mountain Bluebird vs Western Bluebird
- Mountain Bluebird vs Varied Thrush
- Townsend's Solitaire vs Varied Thrush
- Mistle Thrush vs Rufous-bellied Thrush
- Clay-colored Thrush vs Rufous-bellied Thrush
- Rufous-bellied Thrush vs Varied Thrush
- Pale-breasted Thrush vs Rufous-bellied Thrush
- Grey-cheeked Thrush vs Hermit Thrush
- Grey-cheeked Thrush vs Swainson's Thrush
- Grey-cheeked Thrush vs Veery
- Great Thrush vs Rufous-bellied Thrush
- Great Thrush vs Pale-breasted Thrush
- Austral Thrush vs Rufous-bellied Thrush
- Austral Thrush vs Pale-breasted Thrush
- Austral Thrush vs Great Thrush
- Black-billed Thrush vs Great Thrush
- Austral Thrush vs Black-billed Thrush
- Creamy-bellied Thrush vs Great Thrush
- Austral Thrush vs Creamy-bellied Thrush
- Black-billed Thrush vs Creamy-bellied Thrush
- Creamy-bellied Thrush vs Ring Ouzel
- Black-billed Thrush vs Ring Ouzel
- Austral Thrush vs Ring Ouzel
- Orange-billed Nightingale-Thrush vs Veery
- Grey-cheeked Thrush vs Orange-billed Nightingale-Thrush
- Chiguanco Thrush vs Kurrichane Thrush
- Chiguanco Thrush vs Karoo Thrush
- Karoo Thrush vs Kurrichane Thrush
- Chiguanco Thrush vs Western Red-legged Thrush
- Kurrichane Thrush vs Western Red-legged Thrush
- Karoo Thrush vs Western Red-legged Thrush
- Andean Solitaire vs Townsend's Solitaire
- Rufous-backed Thrush vs Western Red-legged Thrush
- Karoo Thrush vs Rufous-backed Thrush
- Brown-backed Solitaire vs Townsend's Solitaire
- Andean Solitaire vs Brown-backed Solitaire
- Pale Thrush vs Rufous-backed Thrush
- Olive Thrush vs Pale Thrush
- Olive Thrush vs Spectacled Thrush
- Spectacled Thrush vs White-throated Thrush
- White-necked Thrush vs White-throated Thrush
- Mountain Thrush vs White-necked Thrush
- African Thrush vs Yellow-legged Thrush
- Grey-cheeked Thrush vs Slaty-backed Nightingale-Thrush
- Orange-billed Nightingale-Thrush vs Slaty-backed Nightingale-Thrush
- Grey-cheeked Thrush vs Ruddy-capped Nightingale-Thrush
- Orange-billed Nightingale-Thrush vs Ruddy-capped Nightingale-Thrush
- Ruddy-capped Nightingale-Thrush vs Slaty-backed Nightingale-Thrush
- Ecuadorian Thrush vs Yellow-legged Thrush
- African Thrush vs Ecuadorian Thrush
- Ecuadorian Thrush vs Glossy-black Thrush
- African Thrush vs Glossy-black Thrush
- Grey-backed Thrush vs Rufous-collared Thrush
- Eyebrowed Thrush vs Rufous-collared Thrush
- Eyebrowed Thrush vs Grey-backed Thrush
- Black-throated Thrush vs Rufous-collared Thrush
- Black-throated Thrush vs Grey-backed Thrush
- Black-throated Thrush vs Eyebrowed Thrush
- Eyebrowed Thrush vs Sooty Thrush
- Black-throated Thrush vs Sooty Thrush
- Black-headed Nightingale-Thrush vs Orange-billed Nightingale-Thrush
- Black-headed Nightingale-Thrush vs Slaty-backed Nightingale-Thrush
- Black-headed Nightingale-Thrush vs Ruddy-capped Nightingale-Thrush
- Black-billed Nightingale-Thrush vs Slaty-backed Nightingale-Thrush
- Black-billed Nightingale-Thrush vs Ruddy-capped Nightingale-Thrush
- Black-billed Nightingale-Thrush vs Black-headed Nightingale-Thrush
- Andean Solitaire vs Omao
- Brown-backed Solitaire vs Omao
- Abyssinian Thrush vs Sooty Thrush
- Omao vs Slate-colored Solitaire
- Bicknell's Thrush vs Black-headed Nightingale-Thrush
- Bicknell's Thrush vs Black-billed Nightingale-Thrush
- Black-headed Nightingale-Thrush vs Yellow-throated Nightingale-Thrush
- Black-billed Nightingale-Thrush vs Yellow-throated Nightingale-Thrush
- Bicknell's Thrush vs Yellow-throated Nightingale-Thrush
- Russet Nightingale-Thrush vs Yellow-throated Nightingale-Thrush
- Bicknell's Thrush vs Russet Nightingale-Thrush
- Black-billed Nightingale-Thrush vs Russet Nightingale-Thrush
- Cocoa Thrush vs White-chinned Thrush
- Tickell's Thrush vs White-chinned Thrush
- Hauxwell's Thrush vs Tickell's Thrush
- Hauxwell's Thrush vs Pale-eyed Thrush
- Pale-eyed Thrush vs Tickell's Thrush
- Black-hooded Thrush vs Hauxwell's Thrush
- Black-hooded Thrush vs Pale-eyed Thrush
- Omao vs Rufous-throated Solitaire
- Rufous-throated Solitaire vs Slate-colored Solitaire
- Black-hooded Thrush vs Black Thrush
- Scaly Thrush vs White's Thrush
- Black-breasted Thrush vs Black Thrush
- Black-breasted Thrush vs Blacksmith Thrush
- Andean Slaty Thrush vs Black-breasted Thrush
- Andean Slaty Thrush vs Blacksmith Thrush
- Black-breasted Thrush vs Plumbeous-backed Thrush
- Blacksmith Thrush vs Plumbeous-backed Thrush
- Andean Slaty Thrush vs Plumbeous-backed Thrush
- Andean Slaty Thrush vs Forest Thrush
- Forest Thrush vs Plumbeous-backed Thrush
- Black Solitaire vs White-eared Solitaire
- Chestnut-bellied Thrush vs Forest Thrush
Tinamous
- Little Tinamou vs Undulated Tinamou
- Brown Tinamou vs Little Tinamou
- Brown Tinamou vs Undulated Tinamou
- Cinereous Tinamou vs Little Tinamou
- Cinereous Tinamou vs Undulated Tinamou
- Brown Tinamou vs Cinereous Tinamou
- Thicket Tinamou vs Undulated Tinamou
- Brown Tinamou vs Thicket Tinamou
- Cinereous Tinamou vs Thicket Tinamou
- Brown Tinamou vs Tataupa Tinamou
- Cinereous Tinamou vs Tataupa Tinamou
- Tataupa Tinamou vs Thicket Tinamou
- Small-billed Tinamou vs Tataupa Tinamou
- Small-billed Tinamou vs Thicket Tinamou
- Slaty-breasted Tinamou vs Small-billed Tinamou
- Slaty-breasted Tinamou vs Variegated Tinamou
- Brushland Tinamou vs Chilean Tinamou
- Great Tinamou vs Solitary Tinamou
- Andean Tinamou vs Brushland Tinamou
- Andean Tinamou vs Chilean Tinamou
- Great Tinamou vs Grey Tinamou
- Grey Tinamou vs Solitary Tinamou
- Great Tinamou vs White-throated Tinamou
- Solitary Tinamou vs White-throated Tinamou
- Grey Tinamou vs White-throated Tinamou
- Brushland Tinamou vs Ornate Tinamou
- Chilean Tinamou vs Ornate Tinamou
- Andean Tinamou vs Ornate Tinamou
- Highland Tinamou vs Tawny-breasted Tinamou
- Pale-browed Tinamou vs Slaty-breasted Tinamou
- Pale-browed Tinamou vs Variegated Tinamou
Tit-warblers, Bushtits, and Long-tailed Tit
Tits, Chickadees, and Titmice
- Black-capped Chickadee vs Carolina Chickadee
- Black-capped Chickadee vs Chestnut-backed Chickadee
- Carolina Chickadee vs Chestnut-backed Chickadee
- Black-capped Chickadee vs Mountain Chickadee
- Carolina Chickadee vs Mountain Chickadee
- Chestnut-backed Chickadee vs Mountain Chickadee
- Carolina Chickadee vs Marsh Tit
- Chestnut-backed Chickadee vs Marsh Tit
- Marsh Tit vs Mountain Chickadee
- Chestnut-backed Chickadee vs Willow Tit
- Mountain Chickadee vs Willow Tit
- Marsh Tit vs Willow Tit
- Oak Titmouse vs Tufted Titmouse
- Black-crested Titmouse vs Tufted Titmouse
- Black-crested Titmouse vs Oak Titmouse
- Cinereous Tit vs Great Tit
- Boreal Chickadee vs Willow Tit
- Bridled Titmouse vs Tufted Titmouse
- Bridled Titmouse vs Oak Titmouse
- Black-crested Titmouse vs Bridled Titmouse
- Boreal Chickadee vs Mexican Chickadee
- African Blue Tit vs Eurasian Blue Tit
- Boreal Chickadee vs Sombre Tit
- Mexican Chickadee vs Sombre Tit
Tityras, Becards, and Allies
- Rose-throated Becard vs White-winged Becard
- Cinnamon Becard vs Rose-throated Becard
- Cinnamon Becard vs White-winged Becard
- Black-crowned Tityra vs Masked Tityra
- Black-tailed Tityra vs Masked Tityra
- Black-crowned Tityra vs Black-tailed Tityra
- Barred Becard vs Rose-throated Becard
- Barred Becard vs White-winged Becard
- Barred Becard vs Cinnamon Becard
- Barred Becard vs Chestnut-crowned Becard
- Brown-winged Schiffornis vs Greenish Schiffornis
- Barred Becard vs Crested Becard
- Chestnut-crowned Becard vs Crested Becard
- Barred Becard vs Cinereous Becard
- Chestnut-crowned Becard vs Cinereous Becard
- Cinereous Becard vs Crested Becard
- Crested Becard vs Green-backed Becard
- Cinereous Becard vs Green-backed Becard
- Cinereous Becard vs One-colored Becard
- Green-backed Becard vs One-colored Becard
- Grey-collared Becard vs Pink-throated Becard
- Cryptic Becard vs Grey-collared Becard
- Cryptic Becard vs Pink-throated Becard
- Cryptic Becard vs White-naped Xenopsaris
- Cinereous Mourner vs White-naped Xenopsaris
Todies
Toucans
- Keel-billed Toucan vs Yellow-throated Toucan
- Keel-billed Toucan vs White-throated Toucan
- White-throated Toucan vs Yellow-throated Toucan
- Channel-billed Toucan vs Keel-billed Toucan
- Channel-billed Toucan vs Yellow-throated Toucan
- Channel-billed Toucan vs White-throated Toucan
- Toco Toucan vs White-throated Toucan
- Channel-billed Toucan vs Toco Toucan
- Chestnut-eared Aracari vs Collared Aracari
- Northern Emerald Toucanet vs Southern Emerald Toucanet
- Crimson-rumped Toucanet vs Northern Emerald Toucanet
- Crimson-rumped Toucanet vs Southern Emerald Toucanet
- Red-breasted Toucan vs White-throated Toucan
- Channel-billed Toucan vs Red-breasted Toucan
- Red-breasted Toucan vs Toco Toucan
- Collared Aracari vs Fiery-billed Aracari
- Chestnut-eared Aracari vs Fiery-billed Aracari
- Choco Toucan vs Red-breasted Toucan
- Choco Toucan vs Toco Toucan
- Channel-billed Toucan vs Choco Toucan
- Collared Aracari vs Lettered Aracari
- Chestnut-eared Aracari vs Lettered Aracari
- Fiery-billed Aracari vs Lettered Aracari
- Chestnut-eared Aracari vs Many-banded Aracari
- Fiery-billed Aracari vs Many-banded Aracari
- Lettered Aracari vs Many-banded Aracari
- Black-necked Aracari vs Fiery-billed Aracari
- Black-necked Aracari vs Lettered Aracari
- Black-necked Aracari vs Many-banded Aracari
- Black-billed Mountain Toucan vs Grey-breasted Mountain Toucan
- Black-billed Mountain Toucan vs Plate-billed Mountain Toucan
- Grey-breasted Mountain Toucan vs Plate-billed Mountain Toucan
- Golden-collared Toucanet vs Spot-billed Toucanet
- Ivory-billed Aracari vs Lettered Aracari
- Ivory-billed Aracari vs Many-banded Aracari
- Black-necked Aracari vs Ivory-billed Aracari
- Groove-billed Toucanet vs Northern Emerald Toucanet
- Groove-billed Toucanet vs Southern Emerald Toucanet
- Crimson-rumped Toucanet vs Groove-billed Toucanet
- Ivory-billed Aracari vs Saffron Toucanet
- Golden-collared Toucanet vs Yellow-eared Toucanet
- Spot-billed Toucanet vs Yellow-eared Toucanet
- Curl-crested Aracari vs Ivory-billed Aracari
- Curl-crested Aracari vs Saffron Toucanet
- Green Aracari vs Ivory-billed Aracari
- Green Aracari vs Saffron Toucanet
- Curl-crested Aracari vs Green Aracari
- Blue-banded Toucanet vs Groove-billed Toucanet
Tree Babblers, Scimitar Babblers, and Allies
Treecreepers
Treeswifts
Trogons
- Black-headed Trogon vs Gartered Trogon
- Collared Trogon vs Gartered Trogon
- Black-headed Trogon vs Collared Trogon
- Gartered Trogon vs Slaty-tailed Trogon
- Black-headed Trogon vs Slaty-tailed Trogon
- Collared Trogon vs Slaty-tailed Trogon
- Green-backed Trogon vs Slaty-tailed Trogon
- Amazonian Black-throated Trogon vs Green-backed Trogon
- Elegant Trogon vs Green-backed Trogon
- Amazonian Black-throated Trogon vs Elegant Trogon
- Green-backed Trogon vs Surucua Trogon
- Amazonian Black-throated Trogon vs Surucua Trogon
- Elegant Trogon vs Surucua Trogon
- Elegant Trogon vs Masked Trogon
- Masked Trogon vs Surucua Trogon
- Black-tailed Trogon vs Surucua Trogon
- Black-tailed Trogon vs Masked Trogon
- Golden-headed Quetzal vs Resplendent Quetzal
- Black-tailed Trogon vs Blue-crowned Trogon
- Blue-crowned Trogon vs Mountain Trogon
- Blue-crowned Trogon vs Citreoline Trogon
- Citreoline Trogon vs Mountain Trogon
- Mountain Trogon vs White-tailed Trogon
- Citreoline Trogon vs White-tailed Trogon
- Malabar Trogon vs Red-headed Trogon
- Baird's Trogon vs White-tailed Trogon
- Amazonian Trogon vs Baird's Trogon
- Crested Quetzal vs Golden-headed Quetzal
- Crested Quetzal vs Resplendent Quetzal
- Malabar Trogon vs Orange-breasted Trogon
- Orange-breasted Trogon vs Red-headed Trogon
- Baird's Trogon vs Choco Trogon
- Amazonian Trogon vs Choco Trogon
- Baird's Trogon vs Guianan Trogon
- Amazonian Trogon vs Guianan Trogon
- Choco Trogon vs Guianan Trogon
- Golden-headed Quetzal vs White-tipped Quetzal
- Resplendent Quetzal vs White-tipped Quetzal
- Crested Quetzal vs White-tipped Quetzal
- Malabar Trogon vs Scarlet-rumped Trogon
- Red-headed Trogon vs Scarlet-rumped Trogon
- Orange-breasted Trogon vs Scarlet-rumped Trogon
- Ecuadorian Trogon vs Guianan Trogon
- Choco Trogon vs Ecuadorian Trogon
- Diard's Trogon vs Orange-breasted Trogon
- Diard's Trogon vs Scarlet-rumped Trogon
Tropicbirds
Turacos
Tyrant Flycatchers and Allies
- Black Phoebe vs Eastern Phoebe
- Black Phoebe vs Great Kiskadee
- Eastern Kingbird vs Tropical Kingbird
- Great Kiskadee vs Tropical Kingbird
- Eastern Phoebe vs Say's Phoebe
- Black Phoebe vs Say's Phoebe
- Great Kiskadee vs Say's Phoebe
- Eastern Kingbird vs Western Kingbird
- Tropical Kingbird vs Western Kingbird
- Eastern Wood Pewee vs Western Wood Pewee
- Least Flycatcher vs Western Flycatcher
- Least Flycatcher vs Willow Flycatcher
- Western Flycatcher vs Willow Flycatcher
- Cassin's Kingbird vs Eastern Kingbird
- Cassin's Kingbird vs Tropical Kingbird
- Cassin's Kingbird vs Western Kingbird
- Acadian Flycatcher vs Least Flycatcher
- Acadian Flycatcher vs Western Flycatcher
- Acadian Flycatcher vs Willow Flycatcher
- Ash-throated Flycatcher vs Great Crested Flycatcher
- Scissor-tailed Flycatcher vs Tropical Kingbird
- Scissor-tailed Flycatcher vs Western Kingbird
- Cassin's Kingbird vs Scissor-tailed Flycatcher
- Boat-billed Flycatcher vs Scissor-tailed Flycatcher
- Boat-billed Flycatcher vs Common Tody-Flycatcher
- Alder Flycatcher vs Willow Flycatcher
- Acadian Flycatcher vs Alder Flycatcher
- Alder Flycatcher vs Boat-billed Flycatcher
- Eastern Wood Pewee vs Olive-sided Flycatcher
- Olive-sided Flycatcher vs Western Wood Pewee
- Dusky-capped Flycatcher vs Great Crested Flycatcher
- Ash-throated Flycatcher vs Dusky-capped Flycatcher
- Brown-crested Flycatcher vs Great Crested Flycatcher
- Ash-throated Flycatcher vs Brown-crested Flycatcher
- Brown-crested Flycatcher vs Dusky-capped Flycatcher
- Cassin's Kingbird vs Grey Kingbird
- Grey Kingbird vs Scissor-tailed Flycatcher
- Alder Flycatcher vs Yellow-bellied Flycatcher
- Rusty-margined Flycatcher vs Social Flycatcher
- Cassin's Kingbird vs Fork-tailed Flycatcher
- Fork-tailed Flycatcher vs Scissor-tailed Flycatcher
- Fork-tailed Flycatcher vs Grey Kingbird
- Alder Flycatcher vs Hammond's Flycatcher
- Hammond's Flycatcher vs Yellow-bellied Flycatcher
- Cattle Tyrant vs Hammond's Flycatcher
- Cattle Tyrant vs Streaked Flycatcher
- Cattle Tyrant vs Southern Beardless Tyrannulet
- Couch's Kingbird vs Grey Kingbird
- Couch's Kingbird vs Fork-tailed Flycatcher
- American Dusky Flycatcher vs Yellow-bellied Flycatcher
- American Dusky Flycatcher vs Hammond's Flycatcher
- American Dusky Flycatcher vs Piratic Flycatcher
- Couch's Kingbird vs Piratic Flycatcher
- Bright-rumped Attila vs Piratic Flycatcher
- Golden-faced Tyrannulet vs Guatemalan Tyrannulet
- American Grey Flycatcher vs Yellow-bellied Flycatcher
- American Grey Flycatcher vs Hammond's Flycatcher
- American Dusky Flycatcher vs American Grey Flycatcher
- Streaked Flycatcher vs Sulphur-bellied Flycatcher
- White-crested Elaenia vs Yellow-bellied Elaenia
- Eastern Wood Pewee vs Southern Tropical Pewee
- Southern Tropical Pewee vs Western Wood Pewee
- Olive-sided Flycatcher vs Southern Tropical Pewee
- Grey-capped Flycatcher vs Social Flycatcher
- Grey-capped Flycatcher vs Rusty-margined Flycatcher
- Greater Pewee vs Western Wood Pewee
- Greater Pewee vs Olive-sided Flycatcher
- Greater Pewee vs Southern Tropical Pewee
- Mountain Elaenia vs Yellow-bellied Elaenia
- Mountain Elaenia vs White-crested Elaenia
- Mountain Elaenia vs Yellow-crowned Tyrannulet
- Scale-crested Pygmy Tyrant vs Yellow-crowned Tyrannulet
- Ash-throated Flycatcher vs Short-crested Flycatcher
- Dusky-capped Flycatcher vs Short-crested Flycatcher
- Brown-crested Flycatcher vs Short-crested Flycatcher
- Short-crested Flycatcher vs Yellow-crowned Tyrannulet
- Cinnamon Flycatcher vs Short-crested Flycatcher
- Cinnamon Flycatcher vs Scale-crested Pygmy Tyrant
- Cinnamon Flycatcher vs Yellow-crowned Tyrannulet
- Fire-eyed Diucon vs White-crested Tyrannulet
- Austral Negrito vs Fire-eyed Diucon
- Bran-colored Flycatcher vs Fire-eyed Diucon
- Bran-colored Flycatcher vs Long-tailed Tyrant
- Austral Negrito vs Long-tailed Tyrant
- Long-tailed Tyrant vs White-crested Tyrannulet
- Greenish Elaenia vs Spectacled Tyrant
- Slaty-capped Flycatcher vs Spectacled Tyrant
- Golden-bellied Flycatcher vs Streaked Flycatcher
- Golden-bellied Flycatcher vs Sulphur-bellied Flycatcher
- Golden-bellied Flycatcher vs Spectacled Tyrant
- Masked Water Tyrant vs Pied Water Tyrant
- Sepia-capped Flycatcher vs Slaty-capped Flycatcher
- Lesser Kiskadee vs Sepia-capped Flycatcher
- Ochre-lored Flatbill vs Yellow-olive Flatbill
- Lesser Kiskadee vs Ochre-lored Flatbill
- Lesser Kiskadee vs White-throated Tyrannulet
- Grey Kingbird vs Loggerhead Kingbird
- Fork-tailed Flycatcher vs Loggerhead Kingbird
- Couch's Kingbird vs Loggerhead Kingbird
- Olive-sided Flycatcher vs Smoke-colored Pewee
- Smoke-colored Pewee vs Southern Tropical Pewee
- Greater Pewee vs Smoke-colored Pewee
- Small-billed Elaenia vs Yellow-bellied Elaenia
- Small-billed Elaenia vs White-crested Elaenia
- Mountain Elaenia vs Small-billed Elaenia
- Cliff Flycatcher vs Small-billed Elaenia
- Cliff Flycatcher vs Yellow Tyrannulet
- Torrent Tyrannulet vs White-crested Tyrannulet
- Torrent Tyrannulet vs Yellow Tyrannulet
- Caribbean Elaenia vs White-crested Elaenia
- Caribbean Elaenia vs Mountain Elaenia
- Caribbean Elaenia vs Small-billed Elaenia
- Loggerhead Kingbird vs Thick-billed Kingbird
- Ornate Flycatcher vs Thick-billed Kingbird
- Caribbean Elaenia vs Ornate Flycatcher
- American Grey Flycatcher vs Yellowish Flycatcher
- Ornate Flycatcher vs Yellowish Flycatcher
- Common Tody-Flycatcher vs Yellow-lored Tody-Flycatcher
- Euler's Flycatcher vs Many-colored Rush Tyrant
- Many-colored Rush Tyrant vs Yellow-lored Tody-Flycatcher
- Many-colored Rush Tyrant vs Slaty-headed Tody-Flycatcher
- Slaty-headed Tody-Flycatcher vs White-headed Marsh Tyrant
- Many-colored Rush Tyrant vs White-headed Marsh Tyrant
- Eye-ringed Flatbill vs White-headed Marsh Tyrant
- Brown-crested Flycatcher vs Pale-edged Flycatcher
- Pale-edged Flycatcher vs Short-crested Flycatcher
- Short-crested Flycatcher vs Swainson's Flycatcher
- Pale-edged Flycatcher vs Swainson's Flycatcher
- Ochre-bellied Flycatcher vs Streak-necked Flycatcher
- Puerto Rican Flycatcher vs Short-crested Flycatcher
- Pale-edged Flycatcher vs Puerto Rican Flycatcher
- Puerto Rican Flycatcher vs Swainson's Flycatcher
- Ochre-faced Tody-Flycatcher vs Slaty-headed Tody-Flycatcher
- Crowned Slaty Flycatcher vs Variegated Flycatcher
- Crowned Slaty Flycatcher vs Yellow-browed Tyrant
- Ochre-faced Tody-Flycatcher vs Yellow-browed Tyrant
- American Grey Flycatcher vs Buff-breasted Flycatcher
- Buff-breasted Flycatcher vs Yellowish Flycatcher
- Buff-breasted Flycatcher vs Yellow-browed Tyrant
- Black-headed Tody-Flycatcher vs Common Tody-Flycatcher
- Black-headed Tody-Flycatcher vs Yellow-lored Tody-Flycatcher
- Pale-edged Flycatcher vs Panama Flycatcher
- Panama Flycatcher vs Swainson's Flycatcher
- Panama Flycatcher vs Puerto Rican Flycatcher
- Yellow-margined Flatbill vs Yellow-olive Flatbill
- Ochre-lored Flatbill vs Yellow-margined Flatbill
- Planalto Tyrannulet vs Sooty-headed Tyrannulet
- La Sagra's Flycatcher vs Puerto Rican Flycatcher
- La Sagra's Flycatcher vs Panama Flycatcher
- Nutting's Flycatcher vs Puerto Rican Flycatcher
- Nutting's Flycatcher vs Panama Flycatcher
- La Sagra's Flycatcher vs Nutting's Flycatcher
- Large Elaenia vs Small-billed Elaenia
- Caribbean Elaenia vs Large Elaenia
- Lesser Elaenia vs Small-billed Elaenia
- Caribbean Elaenia vs Lesser Elaenia
- Large Elaenia vs Lesser Elaenia
- Sooty Tyrannulet vs White-crested Tyrannulet
- Sooty Tyrannulet vs Torrent Tyrannulet
- Grey Monjita vs Sooty Tyrannulet
- Grey Monjita vs Lesser Elaenia
- Bright-rumped Attila vs Grey-hooded Attila
- Grey-hooded Attila vs Grey Monjita
- Grey-hooded Attila vs Patagonian Tyrant
- Grey Monjita vs Patagonian Tyrant
- Cuban Pewee vs Southern Tropical Pewee
- Cuban Pewee vs Greater Pewee
- Cuban Pewee vs Smoke-colored Pewee
- Cuban Pewee vs Patagonian Tyrant
- Cuban Pewee vs Suiriri Flycatcher
- Northern Scrub Flycatcher vs Suiriri Flycatcher
- Common Tody-Flycatcher vs Spotted Tody-Flycatcher
- Spotted Tody-Flycatcher vs Yellow-lored Tody-Flycatcher
- Black-headed Tody-Flycatcher vs Spotted Tody-Flycatcher
- Spotted Tody-Flycatcher vs Suiriri Flycatcher
- Fuscous Flycatcher vs Spotted Tody-Flycatcher
- Eared Pygmy Tyrant vs Fuscous Flycatcher
- White-banded Tyrannulet vs White-throated Tyrannulet
- Fuscous Flycatcher vs White-banded Tyrannulet
- Straneck's Tyrannulet vs White-crested Tyrannulet
- Straneck's Tyrannulet vs Torrent Tyrannulet
- Sooty Tyrannulet vs Straneck's Tyrannulet
- Brown-backed Chat-Tyrant vs Rufous-breasted Chat-Tyrant
- White Monjita vs White-rumped Monjita
- Northern Bentbill vs Southern Bentbill
- Grey-crowned Flatbill vs Yellow-olive Flatbill
- Grey-crowned Flatbill vs Ochre-lored Flatbill
- Grey-crowned Flatbill vs Yellow-margined Flatbill
- Stub-tailed Spadebill vs White-throated Spadebill
- White-tailed Tyrannulet vs White-throated Tyrannulet
- White-banded Tyrannulet vs White-tailed Tyrannulet
- Brown-backed Chat-Tyrant vs Slaty-backed Chat-Tyrant
- Rufous-breasted Chat-Tyrant vs Slaty-backed Chat-Tyrant
- Greenish Elaenia vs Grey-headed Elaenia
- Marble-faced Bristle Tyrant vs Pale-eyed Pygmy Tyrant
- Pale-eyed Pygmy Tyrant vs White-ringed Flycatcher
- Grey-headed Elaenia vs Pale-eyed Pygmy Tyrant
- Golden-faced Tyrannulet vs Slender-footed Tyrannulet
- Guatemalan Tyrannulet vs Slender-footed Tyrannulet
- Drab Water Tyrant vs Slender-footed Tyrannulet
- Yellow-browed Tody-Flycatcher vs Yellow-lored Tody-Flycatcher
- Black-headed Tody-Flycatcher vs Yellow-browed Tody-Flycatcher
- Spotted Tody-Flycatcher vs Yellow-browed Tody-Flycatcher
- Drab Water Tyrant vs Yellow-browed Tody-Flycatcher
- Brown-capped Tyrannulet vs Yellow-bellied Tyrannulet
- Black-capped Pygmy Tyrant vs Eared Pygmy Tyrant
- Ochre-bellied Flycatcher vs Olive-striped Flycatcher
- Olive-striped Flycatcher vs Streak-necked Flycatcher
- Rufous-crowned Tody-Flycatcher vs Slaty-headed Tody-Flycatcher
- Ochre-faced Tody-Flycatcher vs Rufous-crowned Tody-Flycatcher
- Large Elaenia vs Sierran Elaenia
- Lesser Elaenia vs Sierran Elaenia
- Rufous-breasted Flycatcher vs Slaty-capped Flycatcher
- Rufous-breasted Flycatcher vs Sepia-capped Flycatcher
- Golden-crowned Spadebill vs White-throated Spadebill
- Golden-crowned Spadebill vs Stub-tailed Spadebill
- Golden-crowned Spadebill vs Streamer-tailed Tyrant
- Black-capped Flycatcher vs Yellowish Flycatcher
- Black-capped Flycatcher vs Buff-breasted Flycatcher
- Black-capped Flycatcher vs Streamer-tailed Tyrant
- Grey-hooded Flycatcher vs Ochre-bellied Flycatcher
- Grey-hooded Flycatcher vs Streak-necked Flycatcher
- Grey-hooded Flycatcher vs Olive-striped Flycatcher
- Grey-hooded Flycatcher vs Streamer-tailed Tyrant
- Bright-rumped Attila vs Cinnamon Attila
- Cinnamon Attila vs Grey-hooded Attila
- Large Elaenia vs Plain-crested Elaenia
- Lesser Elaenia vs Plain-crested Elaenia
- Plain-crested Elaenia vs Sierran Elaenia
- Brown-backed Chat-Tyrant vs White-browed Chat-Tyrant
- Rufous-breasted Chat-Tyrant vs White-browed Chat-Tyrant
- Slaty-backed Chat-Tyrant vs White-browed Chat-Tyrant
- Eastern Olivaceous Flatbill vs Eye-ringed Flatbill
- Tufted Tit-Tyrant vs Yellow-billed Tit-Tyrant
- Rusty-fronted Tody-Flycatcher vs Slaty-headed Tody-Flycatcher
- Ochre-faced Tody-Flycatcher vs Rusty-fronted Tody-Flycatcher
- Rufous-crowned Tody-Flycatcher vs Rusty-fronted Tody-Flycatcher
- Dark-faced Ground Tyrant vs Spot-billed Ground Tyrant
- Eared Pygmy Tyrant vs Short-tailed Pygmy Tyrant
- Black-capped Pygmy Tyrant vs Short-tailed Pygmy Tyrant
- Apical Flycatcher vs Yucatan Flycatcher
- Fulvous-crowned Scrub Tyrant vs Fulvous-faced Scrub Tyrant
- Fulvous-faced Scrub Tyrant vs Sulphury Flycatcher
- Apical Flycatcher vs Galapagos Flycatcher
- Galapagos Flycatcher vs Yucatan Flycatcher
- Dark-faced Ground Tyrant vs Rufous-naped Ground Tyrant
- Rufous-naped Ground Tyrant vs Spot-billed Ground Tyrant
- Bran-colored Flycatcher vs Flavescent Flycatcher
- Black-throated Tody-Tyrant vs Pearly-vented Tody-Tyrant
- Black-billed Shrike-Tyrant vs Great Shrike-Tyrant
- Dark-faced Ground Tyrant vs White-browed Ground Tyrant
- Spot-billed Ground Tyrant vs White-browed Ground Tyrant
- Rufous-naped Ground Tyrant vs White-browed Ground Tyrant
- Apical Flycatcher vs Stolid Flycatcher
- Stolid Flycatcher vs Yucatan Flycatcher
- Galapagos Flycatcher vs Stolid Flycatcher
- Crested Black Tyrant vs White-winged Black Tyrant
- Blue-billed Black Tyrant vs White-winged Black Tyrant
- Blue-billed Black Tyrant vs Crested Black Tyrant
- Loggerhead Kingbird vs White-throated Kingbird
- Thick-billed Kingbird vs White-throated Kingbird
- Andean Negrito vs Austral Negrito
- Grey-capped Tyrannulet vs Sooty-headed Tyrannulet
- Grey-capped Tyrannulet vs Planalto Tyrannulet
- Golden-faced Tyrannulet vs Peruvian Tyrannulet
- Guatemalan Tyrannulet vs Peruvian Tyrannulet
- Peruvian Tyrannulet vs Slender-footed Tyrannulet
- Lesser Antillean Pewee vs Smoke-colored Pewee
- Cuban Pewee vs Lesser Antillean Pewee
- Drab-breasted Bamboo Tyrant vs Pearly-vented Tody-Tyrant
- Black-throated Tody-Tyrant vs Drab-breasted Bamboo Tyrant
- Helmeted Pygmy Tyrant vs Scale-crested Pygmy Tyrant
- Sierran Elaenia vs Small-headed Elaenia
- Plain-crested Elaenia vs Small-headed Elaenia
- White-throated Flycatcher vs Yellowish Flycatcher
- Buff-breasted Flycatcher vs White-throated Flycatcher
- Black-capped Flycatcher vs White-throated Flycatcher
- Double-banded Pygmy Tyrant vs Scale-crested Pygmy Tyrant
- Double-banded Pygmy Tyrant vs Helmeted Pygmy Tyrant
- Hangnest Tody-Tyrant vs Pearly-vented Tody-Tyrant
- Black-throated Tody-Tyrant vs Hangnest Tody-Tyrant
- Drab-breasted Bamboo Tyrant vs Hangnest Tody-Tyrant
- Golden-bellied Flycatcher vs Golden-crowned Flycatcher
- Golden-crowned Flycatcher vs Sulphur-bellied Flycatcher
- Marble-faced Bristle Tyrant vs Variegated Bristle Tyrant
- Bronze-olive Pygmy Tyrant vs Rufous-headed Pygmy Tyrant
- Ochre-naped Ground Tyrant vs Spot-billed Ground Tyrant
- Ochre-naped Ground Tyrant vs Rufous-naped Ground Tyrant
- Ochre-naped Ground Tyrant vs White-browed Ground Tyrant
- Ochre-naped Ground Tyrant vs Paramo Ground Tyrant
- Bright-rumped Attila vs White-eyed Attila
- Grey-hooded Attila vs White-eyed Attila
- Cinnamon Attila vs White-eyed Attila
- Cinnamon-bellied Ground Tyrant vs Ochre-naped Ground Tyrant
- Cinnamon-bellied Ground Tyrant vs Paramo Ground Tyrant
- Black-throated Tody-Tyrant vs Eye-ringed Tody-Tyrant
- Drab-breasted Bamboo Tyrant vs Eye-ringed Tody-Tyrant
- Eye-ringed Tody-Tyrant vs Hangnest Tody-Tyrant
- Sad Flycatcher vs Stolid Flycatcher
- Large-headed Flatbill vs Rufous-tailed Flatbill
- Loggerhead Kingbird vs Snowy-throated Kingbird
- Snowy-throated Kingbird vs Thick-billed Kingbird
- Snowy-throated Kingbird vs White-throated Kingbird
- D'Orbigny's Chat-Tyrant vs White-browed Chat-Tyrant
- Black-billed Shrike-Tyrant vs Grey-bellied Shrike-Tyrant
- Great Shrike-Tyrant vs Grey-bellied Shrike-Tyrant
- Hangnest Tody-Tyrant vs Stripe-necked Tody-Tyrant
- Eye-ringed Tody-Tyrant vs Stripe-necked Tody-Tyrant
- Black-capped Flycatcher vs Pine Flycatcher
- Pine Flycatcher vs White-throated Flycatcher
- Buff-breasted Flycatcher vs Pine Flycatcher
- Ochre-naped Ground Tyrant vs Puna Ground Tyrant
- Paramo Ground Tyrant vs Puna Ground Tyrant
- Cinnamon-bellied Ground Tyrant vs Puna Ground Tyrant
- Dusky-chested Flycatcher vs Social Flycatcher
- Dusky-chested Flycatcher vs Rusty-margined Flycatcher
- Dusky-chested Flycatcher vs Grey-capped Flycatcher
- Sclater's Tyrannulet vs Sooty-headed Tyrannulet
- Planalto Tyrannulet vs Sclater's Tyrannulet
- Grey-capped Tyrannulet vs Sclater's Tyrannulet
- Pale-tipped Inezia vs Slender-billed Inezia
- Eye-ringed Tody-Tyrant vs White-bellied Tody-Tyrant
- Stripe-necked Tody-Tyrant vs White-bellied Tody-Tyrant
- Ecuadorian Tyrannulet vs Mottle-cheeked Tyrannulet
- Ringed Antpipit vs Southern Antpipit
- Cuban Pewee vs Tumbes Pewee
- Lesser Antillean Pewee vs Tumbes Pewee
- Grey-hooded Attila vs Rufous-tailed Attila
- Cinnamon Attila vs Rufous-tailed Attila
- Rufous-tailed Attila vs White-eyed Attila
- Cinereous Ground Tyrant vs Puna Ground Tyrant
- Cinnamon Attila vs Citron-bellied Attila
- Citron-bellied Attila vs White-eyed Attila
- Citron-bellied Attila vs Rufous-tailed Attila
- Greenish Tyrannulet vs Grey-capped Tyrannulet
- Greenish Tyrannulet vs Sclater's Tyrannulet
- Greenish Elaenia vs Pacific Elaenia
- Grey-headed Elaenia vs Pacific Elaenia
- Pacific Elaenia vs Shear-tailed Grey Tyrant
- Shear-tailed Grey Tyrant vs Short-tailed Field Tyrant
- Rufous-tailed Tyrant vs Shear-tailed Grey Tyrant
- Rufous-tailed Tyrant vs Short-tailed Field Tyrant
- Three-striped Flycatcher vs White-ringed Flycatcher
- Black-and-white Monjita vs Three-striped Flycatcher
- Mottle-backed Elaenia vs Small-headed Elaenia
- Black-and-white Monjita vs Mottle-backed Elaenia
- Mottle-cheeked Tyrannulet vs Rufous-browed Tyrannulet
- Ecuadorian Tyrannulet vs Rufous-browed Tyrannulet
- Highland Elaenia vs Small-headed Elaenia
- Sad Flycatcher vs Sooty-crowned Flycatcher
- Highland Elaenia vs Mottle-backed Elaenia
- Black-billed Shrike-Tyrant vs Lesser Shrike-Tyrant
- Great Shrike-Tyrant vs Lesser Shrike-Tyrant
- Grey-bellied Shrike-Tyrant vs Lesser Shrike-Tyrant
- Grenada Flycatcher vs Sad Flycatcher
- Grenada Flycatcher vs Sooty-crowned Flycatcher
- Rufous-tailed Flycatcher vs Sad Flycatcher
- Rufous-tailed Flycatcher vs Sooty-crowned Flycatcher
- Grenada Flycatcher vs Rufous-tailed Flycatcher
- Cinereous Ground Tyrant vs White-fronted Ground Tyrant
- Sulphur-bellied Tyrannulet vs White-throated Tyrannulet
- Sulphur-bellied Tyrannulet vs White-banded Tyrannulet
- Sulphur-bellied Tyrannulet vs White-tailed Tyrannulet
- Sulphur-bellied Tyrannulet vs White-bearded Flycatcher
Vangas, Helmetshrikes, and Allies
Wagtails and Pipits
- Grey Wagtail vs White Wagtail
- American Pipit vs Meadow Pipit
- Meadow Pipit vs Tree Pipit
- American Pipit vs Tree Pipit
- Cape Wagtail vs White Wagtail
- Cape Wagtail vs Grey Wagtail
- European Rock Pipit vs Meadow Pipit
- American Pipit vs European Rock Pipit
- European Rock Pipit vs Tree Pipit
- American Pipit vs Water Pipit
- Tree Pipit vs Water Pipit
- European Rock Pipit vs Water Pipit
- Grey Wagtail vs White-browed Wagtail
- Cape Wagtail vs White-browed Wagtail
- European Rock Pipit vs Paddyfield Pipit
- Paddyfield Pipit vs Water Pipit
- African Pipit vs European Rock Pipit
- African Pipit vs Water Pipit
- African Pipit vs Paddyfield Pipit
- Cape Wagtail vs Eastern Yellow Wagtail
- Eastern Yellow Wagtail vs White-browed Wagtail
- Paddyfield Pipit vs Tawny Pipit
- African Pipit vs Tawny Pipit
- African Pied Wagtail vs Cape Wagtail
- African Pied Wagtail vs White-browed Wagtail
- African Pied Wagtail vs Eastern Yellow Wagtail
- African Pipit vs Red-throated Pipit
- Red-throated Pipit vs Tawny Pipit
- Olive-backed Pipit vs Tawny Pipit
- Olive-backed Pipit vs Red-throated Pipit
- Citrine Wagtail vs White-browed Wagtail
- Citrine Wagtail vs Eastern Yellow Wagtail
- African Pied Wagtail vs Citrine Wagtail
- Australian Pipit vs Tawny Pipit
- Australian Pipit vs Red-throated Pipit
- Australian Pipit vs Olive-backed Pipit
- Australian Pipit vs New Zealand Pipit
- New Zealand Pipit vs Richard's Pipit
- Cape Longclaw vs Yellow-throated Longclaw
- Richard's Pipit vs Yellowish Pipit
- Sprague's Pipit vs Yellowish Pipit
- Citrine Wagtail vs Japanese Wagtail
- Forest Wagtail vs Long-billed Pipit
- Japanese Wagtail vs Mountain Wagtail
- Blyth's Pipit vs Long-billed Pipit
- Blyth's Pipit vs Buffy Pipit
- Blyth's Pipit vs Striped Pipit
- Buffy Pipit vs Striped Pipit
- Blyth's Pipit vs Hellmayr's Pipit
- Buffy Pipit vs Hellmayr's Pipit
- Hellmayr's Pipit vs Striped Pipit
- Japanese Wagtail vs Madagascar Wagtail
- Madagascar Wagtail vs Mountain Wagtail
- Paramo Pipit vs Striped Pipit
- Hellmayr's Pipit vs Paramo Pipit
- African Rock Pipit vs Hellmayr's Pipit
- African Rock Pipit vs Paramo Pipit
- Rosy-throated Longclaw vs Yellow-throated Longclaw
- Cape Longclaw vs Rosy-throated Longclaw
- Paramo Pipit vs Pechora Pipit
- African Rock Pipit vs Pechora Pipit
- Paramo Pipit vs Peruvian Pipit
- African Rock Pipit vs Peruvian Pipit
- Pechora Pipit vs Peruvian Pipit
Wattle-eyes and Batises
Waxwings
Weavers and Allies
- Cape Weaver vs Southern Masked Weaver
- Southern Masked Weaver vs Village Weaver
- Cape Weaver vs Village Weaver
- Baya Weaver vs Cape Weaver
- Baya Weaver vs Village Weaver
- Long-tailed Widowbird vs Southern Red Bishop
- Red-collared Widowbird vs Southern Red Bishop
- Long-tailed Widowbird vs Red-collared Widowbird
- Long-tailed Widowbird vs White-winged Widowbird
- Red-collared Widowbird vs White-winged Widowbird
- Red-collared Widowbird vs Yellow-crowned Bishop
- White-winged Widowbird vs Yellow-crowned Bishop
- Yellow Bishop vs Yellow-crowned Bishop
- White-winged Widowbird vs Yellow Bishop
- Baglafecht Weaver vs Holub's Golden Weaver
- Holub's Golden Weaver vs Sociable Weaver
- Northern Red Bishop vs Yellow Bishop
- Northern Red Bishop vs Sociable Weaver
- Red Fody vs White-headed Buffalo Weaver
- Asian Golden Weaver vs Black-breasted Weaver
- Black-necked Weaver vs Chestnut Weaver
- Black-winged Red Bishop vs Northern Red Bishop
- Northern Red Bishop vs Yellow-mantled Widowbird
- Black-winged Red Bishop vs Yellow-mantled Widowbird
- Black Bishop vs Black-winged Red Bishop
- Black Bishop vs Yellow-mantled Widowbird
Whipbirds and Wedgebills
Whistlers and Allies
White-eyes, Yuhinas, and Allies
- Indian White-eye vs Silvereye
- Cape White-eye vs Silvereye
- Cape White-eye vs Indian White-eye
- Indian White-eye vs Warbling White-eye
- Cape White-eye vs Warbling White-eye
- Cape White-eye vs Orange River White-eye
- Orange River White-eye vs Warbling White-eye
- Canary White-eye vs Orange River White-eye
- Northern Yellow White-eye vs Orange River White-eye
- Canary White-eye vs Northern Yellow White-eye
- Chestnut-flanked White-eye vs Malagasy White-eye
- Black-capped White-eye vs Sri Lanka White-eye
White-winged Chough and Apostlebird
Whydahs and Indigobirds
Wood Hoopoes and Scimitarbills
Woodpeckers
- Acorn Woodpecker vs Red-bellied Woodpecker
- Red-bellied Woodpecker vs Red-headed Woodpecker
- Acorn Woodpecker vs Red-headed Woodpecker
- Downy Woodpecker vs Nuttall's Woodpecker
- Downy Woodpecker vs Ladder-backed Woodpecker
- Ladder-backed Woodpecker vs Nuttall's Woodpecker
- Golden-fronted Woodpecker vs Red-bellied Woodpecker
- Acorn Woodpecker vs Golden-fronted Woodpecker
- Golden-fronted Woodpecker vs Red-headed Woodpecker
- Black Woodpecker vs Pileated Woodpecker
- Acorn Woodpecker vs Gila Woodpecker
- Gila Woodpecker vs Red-headed Woodpecker
- Gila Woodpecker vs Golden-fronted Woodpecker
- Downy Woodpecker vs Lesser Spotted Woodpecker
- Lesser Spotted Woodpecker vs Nuttall's Woodpecker
- Ladder-backed Woodpecker vs Lesser Spotted Woodpecker
- Red-breasted Sapsucker vs Yellow-bellied Sapsucker
- Golden-fronted Woodpecker vs Red-crowned Woodpecker
- Gila Woodpecker vs Red-crowned Woodpecker
- Lineated Woodpecker vs Pileated Woodpecker
- Black Woodpecker vs Lineated Woodpecker
- European Green Woodpecker vs Grey-headed Woodpecker
- Red-naped Sapsucker vs Yellow-bellied Sapsucker
- Red-breasted Sapsucker vs Red-naped Sapsucker
- Golden-olive Woodpecker vs Northern Flicker
- Gila Woodpecker vs Hoffmann's Woodpecker
- Hoffmann's Woodpecker vs Red-crowned Woodpecker
- Green-barred Woodpecker vs Northern Flicker
- Golden-olive Woodpecker vs Green-barred Woodpecker
- Black-cheeked Woodpecker vs Red-crowned Woodpecker
- Black-cheeked Woodpecker vs Hoffmann's Woodpecker
- Campo Flicker vs Northern Flicker
- Campo Flicker vs Golden-olive Woodpecker
- Campo Flicker vs Green-barred Woodpecker
- Lewis's Woodpecker vs Red-crowned Woodpecker
- Hoffmann's Woodpecker vs Lewis's Woodpecker
- Black-cheeked Woodpecker vs Lewis's Woodpecker
- Great Spotted Woodpecker vs Syrian Woodpecker
- Hairy Woodpecker vs White-headed Woodpecker
- Hoffmann's Woodpecker vs Yellow-tufted Woodpecker
- Black-cheeked Woodpecker vs Yellow-tufted Woodpecker
- Lewis's Woodpecker vs Yellow-tufted Woodpecker
- Hairy Woodpecker vs Smoky-brown Woodpecker
- Smoky-brown Woodpecker vs White-headed Woodpecker
- Arizona Woodpecker vs Hairy Woodpecker
- Arizona Woodpecker vs White-headed Woodpecker
- Arizona Woodpecker vs Smoky-brown Woodpecker
- Crimson-crested Woodpecker vs Pale-billed Woodpecker
- Williamson's Sapsucker vs Yellow-bellied Sapsucker
- Red-breasted Sapsucker vs Williamson's Sapsucker
- Red-naped Sapsucker vs Williamson's Sapsucker
- Black-backed Woodpecker vs Eurasian Three-toed Woodpecker
- American Three-toed Woodpecker vs Eurasian Three-toed Woodpecker
- American Three-toed Woodpecker vs Black-backed Woodpecker
- White Woodpecker vs Yellow-tufted Woodpecker
- Golden-cheeked Woodpecker vs Yellow-tufted Woodpecker
- Golden-cheeked Woodpecker vs White Woodpecker
- Puerto Rican Woodpecker vs Yellow-tufted Woodpecker
- Puerto Rican Woodpecker vs White Woodpecker
- Golden-cheeked Woodpecker vs Puerto Rican Woodpecker
- Puerto Rican Woodpecker vs Rufous Woodpecker
- Little Woodpecker vs Rufous Woodpecker
- Olivaceous Piculet vs White-barred Piculet
- Olivaceous Piculet vs Rufous Woodpecker
- Red-cockaded Woodpecker vs White-headed Woodpecker
- Red-cockaded Woodpecker vs Smoky-brown Woodpecker
- Arizona Woodpecker vs Red-cockaded Woodpecker
- Great Spotted Woodpecker vs White-backed Woodpecker
- Syrian Woodpecker vs White-backed Woodpecker
- Eurasian Wryneck vs Red-throated Wryneck
- Little Woodpecker vs White-spotted Woodpecker
- European Green Woodpecker vs Lesser Yellownape
- Grey-headed Woodpecker vs Lesser Yellownape
- Blond-crested Woodpecker vs Cinnamon Woodpecker
- Brown-capped Pygmy Woodpecker vs Japanese Pygmy Woodpecker
- Crimson-mantled Woodpecker vs Spot-breasted Woodpecker
- Checkered Woodpecker vs Little Woodpecker
- Checkered Woodpecker vs White-spotted Woodpecker
- Chilean Flicker vs Spot-breasted Woodpecker
- Chilean Flicker vs Crimson-mantled Woodpecker
- Golden-cheeked Woodpecker vs Yucatan Woodpecker
- Puerto Rican Woodpecker vs Yucatan Woodpecker
- Ochre-collared Piculet vs White-barred Piculet
- Ochre-collared Piculet vs Olivaceous Piculet
- Black-rumped Flameback vs Common Flameback
- Little Woodpecker vs Striped Woodpecker
- Striped Woodpecker vs White-spotted Woodpecker
- Checkered Woodpecker vs Striped Woodpecker
- Crimson-mantled Woodpecker vs Guatemalan Flicker
- Chilean Flicker vs Guatemalan Flicker
- Fulvous-breasted Woodpecker vs Great Spotted Woodpecker
- Fulvous-breasted Woodpecker vs Syrian Woodpecker
- Fulvous-breasted Woodpecker vs White-backed Woodpecker
- Hispaniolan Woodpecker vs Yucatan Woodpecker
- West Indian Woodpecker vs Yucatan Woodpecker
- Hispaniolan Woodpecker vs West Indian Woodpecker
- White-fronted Woodpecker vs Yucatan Woodpecker
- Hispaniolan Woodpecker vs White-fronted Woodpecker
- West Indian Woodpecker vs White-fronted Woodpecker
- White-fronted Woodpecker vs Yellow-crowned Woodpecker
- Cardinal Woodpecker vs Olive Woodpecker
- Olive Woodpecker vs Yellow-crowned Woodpecker
- Blond-crested Woodpecker vs Chestnut-colored Woodpecker
- Chestnut-colored Woodpecker vs Cinnamon Woodpecker
- Chestnut-colored Woodpecker vs Yellow-crowned Woodpecker
- Andean Flicker vs Crimson-mantled Woodpecker
- Andean Flicker vs Chilean Flicker
- Andean Flicker vs Guatemalan Flicker
- Checkered Woodpecker vs Red-rumped Woodpecker
- Red-rumped Woodpecker vs Striped Woodpecker
- Speckled Piculet vs White-barred Piculet
- Olivaceous Piculet vs Speckled Piculet
- Ochre-collared Piculet vs Speckled Piculet
- Ochre-collared Piculet vs White-wedged Piculet
- Speckled Piculet vs White-wedged Piculet
- Ochre-collared Piculet vs Scaled Piculet
- Scaled Piculet vs Speckled Piculet
- Scaled Piculet vs White-wedged Piculet
- White-fronted Woodpecker vs Yellow-fronted Woodpecker
- West Indian Woodpecker vs Yellow-fronted Woodpecker
- Grey-headed Woodpecker vs Streak-throated Woodpecker
- Lesser Yellownape vs Streak-throated Woodpecker
- Golden-naped Woodpecker vs Yellow-fronted Woodpecker
- Golden-naped Woodpecker vs White-fronted Woodpecker
- Greater Flameback vs White-naped Woodpecker
- Greyish Piculet vs Speckled Piculet
- Greyish Piculet vs White-wedged Piculet
- Greyish Piculet vs Scaled Piculet
- Blond-crested Woodpecker vs Cream-colored Woodpecker
- Cinnamon Woodpecker vs Cream-colored Woodpecker
- Chestnut-colored Woodpecker vs Cream-colored Woodpecker
- Pileated Woodpecker vs White-bellied Woodpecker
- Black Woodpecker vs White-bellied Woodpecker
- Lineated Woodpecker vs White-bellied Woodpecker
- Pale-billed Woodpecker vs Red-necked Woodpecker
- Crimson-crested Woodpecker vs Red-necked Woodpecker
- Golden-tailed Woodpecker vs Nubian Woodpecker
- Brown-fronted Woodpecker vs Middle Spotted Woodpecker
- Black-rumped Flameback vs Red-backed Flameback
- Common Flameback vs Red-backed Flameback
- Banded Woodpecker vs Greater Yellownape
- Rufous-winged Woodpecker vs Yellow-throated Woodpecker
- Freckle-breasted Woodpecker vs Syrian Woodpecker
- Freckle-breasted Woodpecker vs White-backed Woodpecker
- Freckle-breasted Woodpecker vs Fulvous-breasted Woodpecker
- Japanese Pygmy Woodpecker vs Sunda Pygmy Woodpecker
- Brown-capped Pygmy Woodpecker vs Sunda Pygmy Woodpecker
- Himalayan Woodpecker vs White-backed Woodpecker
- Fulvous-breasted Woodpecker vs Himalayan Woodpecker
- Freckle-breasted Woodpecker vs Himalayan Woodpecker
- Red-rumped Woodpecker vs Red-stained Woodpecker
- Golden-green Woodpecker vs Rufous-winged Woodpecker
- Golden-green Woodpecker vs Yellow-throated Woodpecker
- Cuban Green Woodpecker vs Golden-green Woodpecker
- Cuban Green Woodpecker vs Red-stained Woodpecker
- Chestnut-colored Woodpecker vs Chestnut Woodpecker
- Chestnut Woodpecker vs Cream-colored Woodpecker
- Chestnut Woodpecker vs Cuban Green Woodpecker
- Chestnut-colored Woodpecker vs Variable Woodpecker
- Cream-colored Woodpecker vs Variable Woodpecker
- Chestnut Woodpecker vs Variable Woodpecker
- Golden-naped Woodpecker vs Jamaican Woodpecker
- Ground Woodpecker vs Jamaican Woodpecker
- Ground Woodpecker vs Variable Woodpecker
- Pale-billed Woodpecker vs Powerful Woodpecker
- Crimson-crested Woodpecker vs Powerful Woodpecker
- Powerful Woodpecker vs Red-necked Woodpecker
- Ground Woodpecker vs Powerful Woodpecker
- African Grey Woodpecker vs Cardinal Woodpecker
- African Grey Woodpecker vs Olive Woodpecker
- Freckle-breasted Woodpecker vs Rufous-bellied Woodpecker
- Himalayan Woodpecker vs Rufous-bellied Woodpecker
- Red-rumped Woodpecker vs Scarlet-backed Woodpecker
- Red-stained Woodpecker vs Scarlet-backed Woodpecker
- Bennett's Woodpecker vs Golden-tailed Woodpecker
- Bennett's Woodpecker vs Nubian Woodpecker
- Guayaquil Woodpecker vs Red-necked Woodpecker
- Guayaquil Woodpecker vs Powerful Woodpecker
- Golden-tailed Woodpecker vs Knysna Woodpecker
- Knysna Woodpecker vs Nubian Woodpecker
- Bennett's Woodpecker vs Knysna Woodpecker
- Magellanic Woodpecker vs Red-necked Woodpecker
- Magellanic Woodpecker vs Powerful Woodpecker
- Guayaquil Woodpecker vs Magellanic Woodpecker
- Powerful Woodpecker vs Robust Woodpecker
- Guayaquil Woodpecker vs Robust Woodpecker
- Magellanic Woodpecker vs Robust Woodpecker
- Cream-backed Woodpecker vs Guayaquil Woodpecker
- Cream-backed Woodpecker vs Magellanic Woodpecker
- Cream-backed Woodpecker vs Robust Woodpecker
- Rufous-winged Woodpecker vs Yellow-browed Woodpecker
- Yellow-browed Woodpecker vs Yellow-throated Woodpecker
- Golden-green Woodpecker vs Yellow-browed Woodpecker
- Chestnut Woodpecker vs Pale-crested Woodpecker
- Pale-crested Woodpecker vs Variable Woodpecker
- Red-stained Woodpecker vs Yellow-vented Woodpecker
- Scarlet-backed Woodpecker vs Yellow-vented Woodpecker
- Japanese Green Woodpecker vs Lesser Yellownape
- Japanese Green Woodpecker vs Streak-throated Woodpecker
- Cardinal Woodpecker vs Eastern Grey Woodpecker
- Eastern Grey Woodpecker vs Olive Woodpecker
- African Grey Woodpecker vs Eastern Grey Woodpecker
- Ringed Woodpecker vs Variable Woodpecker
- Pale-crested Woodpecker vs Ringed Woodpecker
- Grey-breasted Woodpecker vs Jamaican Woodpecker
- Guadeloupe Woodpecker vs Jamaican Woodpecker
- Grey-breasted Woodpecker vs Guadeloupe Woodpecker
- Golden-spangled Piculet vs Lafresnaye's Piculet
- Chestnut Piculet vs Lafresnaye's Piculet
- Chestnut Piculet vs Golden-spangled Piculet
- Darjeeling Woodpecker vs Freckle-breasted Woodpecker
- Darjeeling Woodpecker vs Himalayan Woodpecker
- Darjeeling Woodpecker vs Rufous-bellied Woodpecker
- Beautiful Woodpecker vs Grey-breasted Woodpecker
- Beautiful Woodpecker vs Guadeloupe Woodpecker
- Beautiful Woodpecker vs Jamaican Woodpecker
- Black-rumped Flameback vs Himalayan Flameback
- Common Flameback vs Himalayan Flameback
- Himalayan Flameback vs Red-backed Flameback
- Rufous Piculet vs White-browed Piculet
- Darjeeling Woodpecker vs Stripe-breasted Woodpecker
- Andean Flicker vs Grey-crowned Woodpecker
- Black-headed Woodpecker vs Japanese Green Woodpecker
- Ochre-backed Woodpecker vs Pale-crested Woodpecker
- Ochre-backed Woodpecker vs Ringed Woodpecker
- Crimson-naped Woodpecker vs Nuttall's Woodpecker
- Crimson-naped Woodpecker vs Ladder-backed Woodpecker
- Crimson-naped Woodpecker vs Lesser Spotted Woodpecker
Woodswallows, Bellmagpies, and Allies
- Australian Magpie vs Pied Currawong
- Australian Magpie vs Grey Butcherbird
- Australian Magpie vs Pied Butcherbird
- Grey Butcherbird vs Pied Butcherbird
- Ashy Woodswallow vs White-breasted Woodswallow
- Dusky Woodswallow vs White-breasted Woodswallow
- Ashy Woodswallow vs Dusky Woodswallow
- Grey Currawong vs Pied Currawong
- Black-faced Woodswallow vs White-breasted Woodswallow
- Ashy Woodswallow vs Black-faced Woodswallow
- Black-faced Woodswallow vs Dusky Woodswallow
- Black-faced Woodswallow vs Masked Woodswallow
- Black Butcherbird vs Masked Woodswallow
- Black Currawong vs Pied Currawong
- Black Currawong vs Grey Currawong
- Black Butcherbird vs Black Currawong
Wrens
- Carolina Wren vs Northern House Wren
- Carolina Wren vs Eurasian Wren
- Eurasian Wren vs Northern House Wren
- Bewick's Wren vs Carolina Wren
- Bewick's Wren vs Eurasian Wren
- Bewick's Wren vs Marsh Wren
- Northern House Wren vs Winter Wren
- Eurasian Wren vs Winter Wren
- Pacific Wren vs Winter Wren
- Cactus Wren vs Rock Wren
- Canyon Wren vs Rock Wren
- Grass Wren vs Marsh Wren
- Grass Wren vs Rock Wren
- Canyon Wren vs Grass Wren
- Canyon Wren vs Grey-breasted Wood Wren
- Cactus Wren vs Rufous-backed Wren
- Grey-breasted Wood Wren vs White-breasted Wood Wren
- Band-backed Wren vs Cactus Wren
- Band-backed Wren vs Rufous-backed Wren
- Rufous-breasted Wren vs Spot-breasted Wren
- Bay Wren vs Buff-breasted Wren
- Bicolored Wren vs Rufous-backed Wren
- Band-backed Wren vs Bicolored Wren
- Spot-breasted Wren vs Whiskered Wren
- Rufous-breasted Wren vs Whiskered Wren
- Mountain Wren vs Winter Wren
- Mountain Wren vs Pacific Wren
- Bay Wren vs Stripe-breasted Wren
- Buff-breasted Wren vs Stripe-breasted Wren
- Black-bellied Wren vs Spot-breasted Wren
- Black-bellied Wren vs Rufous-breasted Wren
- Black-bellied Wren vs Whiskered Wren
- Bay Wren vs Riverside Wren
- Buff-breasted Wren vs Riverside Wren
- Riverside Wren vs Stripe-breasted Wren
- Happy Wren vs Rufous-breasted Wren
- Happy Wren vs Whiskered Wren
- Black-bellied Wren vs Happy Wren
- Moustached Wren vs Whiskered Wren
- Black-bellied Wren vs Moustached Wren
- Happy Wren vs Moustached Wren
- Ochraceous Wren vs Pacific Wren
- Mountain Wren vs Ochraceous Wren
- Ochraceous Wren vs White-bellied Wren
- Sinaloa Wren vs White-bellied Wren
- Coraya Wren vs Happy Wren
- Coraya Wren vs Moustached Wren
- Black-throated Wren vs Coraya Wren
- Band-backed Wren vs Fasciated Wren
- Bicolored Wren vs Fasciated Wren
- Long-billed Wren vs Stripe-breasted Wren
- Long-billed Wren vs Riverside Wren
- Northern Nightingale-Wren vs Southern Nightingale-Wren
- Rufous Wren vs Sepia-brown Wren
- Coraya Wren vs Plain-tailed Wren
- Black-throated Wren vs Plain-tailed Wren
- Black-throated Wren vs Speckle-breasted Wren
- Plain-tailed Wren vs Speckle-breasted Wren
- Mountain Wren vs Rufous-browed Wren
- Ochraceous Wren vs Rufous-browed Wren
- Fasciated Wren vs Russet-naped Wren
- Riverside Wren vs Superciliated Wren
- Long-billed Wren vs Superciliated Wren
- Plain-tailed Wren vs Sooty-headed Wren
- Sooty-headed Wren vs Speckle-breasted Wren
- Fasciated Wren vs Spotted Wren
- Russet-naped Wren vs Spotted Wren
- Boucard's Wren vs Russet-naped Wren
- Boucard's Wren vs Spotted Wren
- Musician Wren vs Song Wren
- Grey-barred Wren vs Russet-naped Wren
- Grey-barred Wren vs Spotted Wren
- Boucard's Wren vs Grey-barred Wren
- Spotted Wren vs Veracruz Wren
- Boucard's Wren vs Veracruz Wren
- Grey-barred Wren vs Veracruz Wren
- Grey-barred Wren vs Yucatan Wren
- Veracruz Wren vs Yucatan Wren
- Grey-barred Wren vs White-headed Wren
- Veracruz Wren vs White-headed Wren
- White-headed Wren vs Yucatan Wren
- Fawn-breasted Wren vs Long-billed Wren
- Fawn-breasted Wren vs Superciliated Wren
- Fawn-breasted Wren vs Timberline Wren
- Timberline Wren vs White-headed Wren
- Timberline Wren vs Yucatan Wren
- Grey-breasted Wood Wren vs Munchique Wood Wren
- Munchique Wood Wren vs White-breasted Wood Wren