Grey-crowned Flatbill
Tolmomyias poliocephalus
The gray-crowned flatbill is 12 to 12.5 cm (4.7 to 4.9 in) long and weighs about 11 g (0.39 oz). The sexes have the same plumage. Adults of the nominate subspecies have a mostly gray head with a whitish stripe above the lores, a faint whitish eye-ring, and greenish gray ear coverts. Their back, rump, uppertail coverts are olive. Their wings are blackish with yellow edges on the coverts and remiges that appear as two wing bars and sometimes a pale speculum. Their throat is greenish, their breast and flanks olive, and their belly and vent pale yellow. Subspecies T. p. Voice: The grey-crowned flatbill's vocalizations vary among the subspecies. The nominate's song is described as "a repeated, inflected, somewhat wheezy fiwee?" which may be given in a short series or with pauses of one or two seconds between notes. A similar description is "a rising series of clear rising or rising-falling whistles, last notes quavering tuee? tuee? TUEE? tuEEuEE? tuEEuEE?. Subspecies T.
ID text from Wikipedia, CC BY-SA 4.0
Yellow-margined Flatbill
Tolmomyias assimilis
The yellow-margined flatbill is 13 to 13.5 cm (5.1 to 5.3 in) long and weighs 12 to 17.5 g (0.42 to 0.62 oz). The sexes have the same plumage. Adults of the nominate subspecies T. a. assimilis have a mostly olive-tinged gray head with a thin white broken eye-ring. Their back, rump, and uppertail coverts are olive-green. Their wings are dusky with yellow edges on the greater coverts and remiges that appear as a pale speculum and a faint wing bar on the closed wing. Their tail is dusky. Their throat is pale gray, their breast and flanks pale olive, and their belly pale yellow. Voice: The yellow-margined flatbill's vocalizations vary geographically. In the Guianas it makes a "series of typically 2‒5 drawn-out extremely nasal, almost screaming notes". In Ecuador it sings "a leisurely series of 3 whistled notes, each slightly higher-pitched and shriller, e.g. weeeuw...weeeu...weee?
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-crowned Flatbill and Yellow-margined Flatbill.