Spix's Warbling Antbird

Spix's warbling antbird is 11 to 12 cm (4.3 to 4.7 in) long and weighs 10 to 14 g (0.35 to 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 olive-gray with a white patch between the scapulars; their nape and back have black and white streaks. Their rump is rufous. Their flight feathers are rufescent brown with yellowish olive-brown edges and their wing coverts black with white tips. Their tail is rufescent brown with pale buff tips to the feathers. Voice: The song of the male Spix's warbling antbird "commences with a long downslurred note followed by an accelerating series of abrupt and also downslurred notes, always numbering at least seven, and usually 9–10". The female's song "is initiated with a long note and ends in an abrupt note".