Description wikipedia

The large-billed antwren (Herpsilochmus longirostris) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia and Brazil. The large-billed antwren is 12 to 13 cm (4.7 to 5.1 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). As its English name and specific epithet imply, its bill is heavier than those of most other Herpsilochmus antwrens. Adult males have a black crown and nape, a long whitish supercilium, a narrow black streak through the eye, and grayish ear coverts. Their back and rump are gray with a black and white patch between the scapulars and white-tipped black uppertail coverts. Their wings are black with white-tipped coverts and flight feathers with white edges towards the end. Their innermost tail feathers are black with white edges, the outermost entirely white, and those in between black with white tips. Their throat and underparts are mostly white with tiny black spots on the sides of the breast and grayish sides and flanks. Adult females have a rufous-cinnamon crown, cinnamon-tinged gray ear coverts and upperparts, and cinnamon neck, throat, and underparts. Their wings and tail are like the male's.