Grey-crowned Flatbill

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.