Large-billed Antwren

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. == Taxonomy and systematics == The large-billed antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Herpsilochmus longirostris. Its relationship to others of its genus is unclear but it apparently is most closely related to the pectoral antwren (H. pectoralis), and at least one author has considered them to form a superspecies. The large-billed antwren is monotypic. == Description == 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…