Grey-headed Elaenia
Myiopagis caniceps
The grey-headed elaenia is 12 to 14 cm (4.7 to 5.5 in) long and weighs 9.5 to 17 g (0.34 to 0.60 oz). Adult males have a medium gray crown with a partially concealed white stripe along its middle. They have an indistinct whitish loral spot and a grizzled whitish lower face. Their upperparts are olive gray. Their wings are black with white edges on the inner flight feathers and white tips on the coverts; the last form two bars on the closed wing. Their tail is grayish. Their throat is white, their breast pale gray, and their belly grayish white. Adult females are smaller than males. Voice: The grey-headed elaenia's main vocalization is a "series of varying length, starting with 2-4 single/extr. high notes, then gliding down and accelerating to a long trill, slowing down and often finishing with some up-and-down, lilting notes". The species typically vocalizes the most in the early morning but continues intermittently all day; it vocalizes from the forest canopy.
ID text from Wikipedia, CC BY-SA 4.0
Pale-eyed Pygmy Tyrant
Atalotriccus pilaris
The pale-eyed pygmy tyrant is 8 to 11 cm (3.1 to 4.3 in) long and weighs about 6 g (0.21 oz). The sexes have the same plumage. Adults of the nominate subspecies A. p. pilaris have a bright olive crown and nape that are suffused with grayish. Their lores are whitish above and gray below; they have a pale partial eye-ring and gray ear coverts. Their back, rump, and uppertail coverts are bright olive. Their wings are dusky with olive-green edges on the flight feathers and lemon to pale olive tips on the coverts; the latter show as two wing bars. Their tail is dusky. Voice: The pale-eyed pygmy tyrant's vocalizations are loud for a small bird. One author described its voice as "ry tic notes and rapid nasal trills...often combined, e.g. tic-tttttttttt". Another described it as a "very high, slightly descending, dry 'prruh' trill".
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: Grey-headed Elaenia and Pale-eyed Pygmy Tyrant.