Yellow-breasted warbling antbird

The yellow-breasted warbling antbird or yellow-breasted antwarbler, (Hypocnemis subflava) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia, Brazil, and Peru.

The yellow-breasted warbling antbird is about 12 cm (4.7 in) long and weighs about 14 g (0.49 oz). Adult males of the nominate subspecies have a black crown with a white central streak and a white supercilium on an otherwise black and white speckled face. Their upperparts are gray with a white patch between the scapulars and heavy black and white speckling. Their flight feathers are gray-brown with yellowish olive-brown edges and their wing coverts black with white tips. Their tail is gray-brown with pale buff tips to the feathers. Their underparts are mostly plain yellow with weak rufous flanks and pale buff undertail coverts. Females have the same pattern but different colors than males. Their upperparts are heavily marked with dusky and buff. Subspecies H. s. collinsi has paler gray upperparts than the nominate, with fewer black and white spots; females have pale olive-gray upperparts.