Yellow-breasted Antwren

The yellow-breasted antwren is 11 to 12 cm (4.3 to 4.7 in) long and weighs 10 to 13 g (0.35 to 0.46 oz). Adult males of the nominate subspecies H. a. axillaris have a black crown and nape with white spots on the crown and a broken whitish supercilium on an otherwise mottled blackish and yellow-olive face. Their upperparts are olive-gray. Their wings coverts are black with yellow-tinged white edges and tips; their flight feathers are very dark gray. Their tail is mostly dark gray, with white tips and part of the edges of the inner feathers and mostly white outer feathers. Voice: The yellow-breasted antwren's song is "a rattle-like trill of dry notes". It has been written as "tree-ee-ee-ee-ee-ee-ew" in Ecuador. In northern Peru it is "tee-tee-TI-TI-titi'ti'tititititititer" and in Cuzco "chew tew-tew-TEE-TEE-ti-ti'ti'ti'tititi". The species' call is "a short...downslurred whistle" written as "tew" or "tchew".