Black-and-white Antbird

The black-and-white antbird is 10 to 12.2 cm (3.9 to 4.8 in) long and weighs 12 to 13 g (0.42 to 0.46 oz). Adult males' face, crown, nape, and upperparts are black except for a mostly hidden white patch between the shoulders. Their wings are black with sparse white tips on the coverts. Their tail is short, somewhat graduated, and black with white tips on the feathers. Their throat and underparts are white with variable amounts of buff on the flanks and belly. Adult females resemble males with the addition of white spots on the lores and a buffier belly and undertail coverts. Voice: The black-and-white antbird's song is "an accelerating, descending, series of hollow, piping notes: PU-pu-pu'pu'puprrrrr" that is often sung as a duet with the female's voice being higher pitched. Its calls include "a series of hollow piping notes pu pu pu, also a more rapid musical rattle (similar to end of song), sometimes in series, also a single peu and a bisyllabic tuk-et"