The round-tailed manakin (Ceratopipra chloromeros) is a species of bird in the family Pipridae. It is found in Bolivia, Brazil, and Peru. == Taxonomy and systematics == The red-headed manakin was originally described as Pipra chloromeros. Though its present genus Ceratopipra had been erected in 1854, the round-tailed manakin was not transferred to it until the early 2000s. The round-tailed manakin is monotypic. == Description == 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. Immature birds of both sexes resemble adult females but with a darker gray iris. == Distribution and habitat == The round-tailed manakin is found from southern Amazonas Department in eastern Peru south through…