Yellow-winged Flatbill

The yellow-winged flatbill is 13 to 13.5 cm (5.1 to 5.3 in) long and weighs about 15 g (0.53 oz). The sexes have the same plumage. Adults have a mostly dark gray head with a white eye-ring. Their back, rump, uppertail coverts, and tail are olive-green. Their wings are dusky with wide yellow feather edges that give the species its English name. Their throat and breast are pale gray with a yellowish wash and their belly and undertail coverts are yellow. They have an olive to dark brown iris, a wide flat bill with a black maxilla and a pale brownish to horn mandible, and gray legs and feet. Voice: The yellow-winged flatbill's song has been described as "an emphatic tssk, tssp, tssp, tssp" and "a harsh and very emphatic series of short notes, zhweyk, zhwek-zhwek-zhwek-zhwek. The species typically sings from a well-hidden perch high in the forest, and mostly in the morning and late afternoon.