Dusky-tailed Flatbill

The dusky-tailed flatbill is 15.5 to 16.5 cm (6.1 to 6.5 in) long and weighs about 16.5 to 20.5 g (0.58 to 0.72 oz). The sexes have the same plumage. Adults have a dark olive crown, grayish lores, and a thin yellow-green line behind the lores and under the eye on an otherwise dark olive face. Their upperparts are mostly dark olive with slightly lighter uppertail coverts. Their wings are mostly fuscous-black with thin buffy olive edges on the primaries and old gold edges on the secondaries and tertials. Their wing coverts have wide rufous brown or cinnamon edges that show as two wing bars. Voice: The dusky-tailed flatbill's dawn song is "a descending mellow whistle followed by a musical hiccup PEEWW'wichwee, in which the terminal phrase may vary, e.g. PEEWW'weeher". Its calls include "a mellow whistle followed by a decelerating, descending musical chatter: PEEEWWW trrr'PEER-peer-pur" and "a mellow falling-rising whistle: PEEeer'wee?".