Brown-capped Tyrannulet
Ornithion brunneicapillus
The brown-capped tyrannulet is about 8 cm (3.1 in) long and weighs about 7 to 8 g (0.25 to 0.28 oz). It is a small flycatcher with a pointed bill. The sexes have the same plumage. Adults have a brownish olive to dark brown crown with a white forehead, lores, and supercilium on an otherwise olive face. Their upperparts are olive. Their wings and tail are dusky olive. Their underparts are bright yellow with faint olive streaks on the breast and flanks. Both sexes have a brown iris, a black bill with an arched maxilla, and dark gray legs and feet. Voice: The brown-capped tyrannulet's primary vocalization is a "eries of 4–6 high metallic or piping whistles, each slightly downward-slurred, slight pause after first note, 'pee, pey-pey-pew' ". It also makes a "single high-pitched 'peeep' ".
ID text from Wikipedia, CC BY-SA 4.0
Yellow-bellied Tyrannulet
Ornithion semiflavum
The yellow-bellied tyrannulet is 8 to 9 cm (3.1 to 3.5 in) long and weighs about 7 to 8 g (0.25 to 0.28 oz). It is a small flycatcher with a pointed bill. The sexes have the same plumage. Adults have a slate-grey crown with a white forehead, lores, and supercilium on an otherwise olive-brown face. Their upperparts are bright olive. Their wings and tail are dusky olive. Their underparts are bright yellow with faint olive streaks on the breast and flanks. Both sexes have a brown iris, a black bill with an arched maxilla, and dark gray legs and feet. Voice: The yellow-bellied tyrannulet's call is "a high-pitched whistle (weeauuuu or peauuuu)" that is sometimes doubled. It also makes "an agitated 'rubber duck' quality series of whistles pip'a'pip'a-pip-pip-peauuu-peauuu-pip'a-pip'a'pip'a".
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: Brown-capped Tyrannulet and Yellow-bellied Tyrannulet.