Rufous-tailed Flatbill

The rufous-tailed flatbill is 15 to 16 cm (5.9 to 6.3 in) long and weighs about 17 to 26 g (0.60 to 0.92 oz). The sexes have the same plumage. Adults have an olive-green crown, a faint pale line behind the lores, and a faint pale eye-ring on an otherwise dark olive-green face. Their upperparts are mostly dark olive-green with bright rufous uppertail coverts. Their wings are mostly blackish with wide bright rufous edges on the flight feathers and tips on the coverts; the latter show as two wing bars. Their tail is bright rufous. Voice: The rufous-tailed flatbill's dawn song is "a low mewing whistle ending with a higher hiccup: meeoooOOoo'WEEpur!". Its day vocalization, which might be either a call or song, is "a low, rising-falling or slightly quavering, mewing whistle: meeooo, or with terminal emphasis: meeooo'OO", also described as a "high, slow, mournful weaeaea-wur".