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

Ochre-lored Flatbill
Tolmomyias flaviventris
The ochre-lored flatbill is about 12 to 13 cm (4.7 to 5.1 in) long and weighs 9 to 17.5 g (0.32 to 0.62 oz). The sexes have the same plumage. Adults of the nominate subspecies have a yellowish olive head with a brighter ochre-tinged stripe above the lores and a brighter ochre-tinged eye-ring. Their back, rump, and uppertail coverts are yellowish olive. Their wings are dusky with yellowish edges on the coverts and remiges that appear as two wing bars. Their tail is dusky. Their underparts are bright yellow with an olive to ochre wash on the throat and breast and lightly on the belly. Voice: The ochre-lored flatbill sings "3-5 rather loud, penetrating whistles, sweeEP!....sweeEP!.....sweeEP!, with pauses of 1-several sec between notes". Its call is "a single sweeEP!". It also makes a "mid-high, short fddddddddfit rattle". It usually sings from a well-hidden perch in the forest canopy, and usually around dawn.
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 Ochre-lored Flatbill.