Black-capped Antwren

The black-capped antwren is 11 to 12 cm (4.3 to 4.7 in) long and weighs 8 to 11 g (0.28 to 0.39 oz). Adult males have a black crown and nape, a long white to pale gray supercilium, and a black streak through the eye. The rest of their upperparts are gray with white-edged blackish scapulars and a white patch between them. Their wings are black with white tips on the coverts and white edges on the flight feathers. Their tail is black with large white feather tips and white edges on the outermost. Their underparts are mostly gray to pale gray with a white belly. Voice: The black-capped antwren's song varies somewhat across its range but is generally "1–2 (rarely 3) distinct notes leading into rapid series (e.g. 24 notes, 2·3 seconds) rising and falling in pitch and slowing, initial notes at same pitch or higher than abrupt notes that follow". It also has a rattle song, "a series of short but complex notes, more rarely a shorter series of simpler notes".