Narrow-billed Antwren

The narrow-billed antwren is 11 to 12 cm (4.3 to 4.7 in) long; one male weighed 8.2 g (0.29 oz). The species is sexually dimorphic and has a longish bill and tail. Adult males are mostly dark gray. Their wings and tail are a darker blackish gray, with white tips on the wing coverts and the outer tail feathers. The center of their throat and breast are black, their flanks white, and their undertail coverts have white bars. Adult females have a pale supercilium and a whitish eye ring. Voice: The narrow-billed antwren's song is a "series of very high, loud 'tiúw' notes (2/sec over 8 sec)". Its calls "include abrupt notes, often in pairs or triplets, and short rattle".