Round-tailed Manakin

The round-tailed manakin is 10.5 to 11 cm (4.1 to 4.3 in) long and weighs about 16.5 g (0.58 oz). The species is sexually dimorphic. Its tail has a rounder end than those of other Ceratopipra manakins. Adult males have an almost entirely red head and neck. Their thighs are creamy yellow. Their throat and the rest of their plumage are black. Adult females are mostly dull olive-green; their underparts are lighter than their back, especially on the belly. Both sexes have a blackish bill and smoky pinkish legs and feet. Males have a white iris and females a grayish one. Voice: The round-tailed manakin sings "variable high metallic sounds, mellow whistles, squeaky chatters, and buzzes". Two vocalizations are "a buzzy tsuk'ZRRRT" and a "high rising-falling laugh".