Cockatiel
Nymphicus hollandicus
The cockatiel's distinctive crest expresses the animal's emotional state. The crest is dramatically vertical when the cockatiel is startled or excited, gently oblique in its neutral or relaxed state, and flattened close to the head when the animal is angry or defensive. The crest is also held flat but protrudes outward in the back when the cockatiel is trying to appear alluring or flirtatious. When the cockatiel is tired, the crest is seen positioned halfway upwards, with the tip of the crest usually curling upward.
ID text from Wikipedia, CC BY-SA 4.0
Gang-gang Cockatoo
Callocephalon fimbriatum
The gang-gang cockatoo is 32–37 cm (13–15 in) in length with a 62–76 cm (24–30 in) wingspan, and weighs 230–334 grams. They are grey birds with wispy crests. The head and crest are bright red in males, but dark grey in females. The edges of feathers in the underparts have edges of yellow or pink. The edges of feathers on the upperparts are slightly paler grey than the rest of the feather, which makes the bird look somewhat barred. Juvenile males can be distinguished by their brighter crowns and shorter crests, but otherwise look similar to the adult female.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Cockatiel and Gang-gang Cockatoo.