Eastern Olivaceous Flatbill

The eastern olivaceous flatbill is about 15 cm (5.9 in) long and weighs 18 to 24.8 g (0.63 to 0.87 oz). The sexes have the same plumage. Adults of the nominate subspecies have a dark olive head with a white eye-ring. Their entire upperparts are dark olive. Their wings are dusky with ochre to buff edges on the wing coverts and secondaries that form two dull wing bars. Their tertials have yellow edges. Their tail is a dusky with paler outer edges on the feathers. Their throat is pale gray to pale yellow, their breast grayish olive, and their belly, flanks, and vent are pale yellow. Voice: Researchers have identified two eastern olivaceous flatbill vocalizations. Its song is a "series of some 10 notes, starting with 1‒2 long notes and followed by much shorter notes". It may either ascend or descend and may be as short as just the initial notes with two shorter ones.