Black-bellied Antwren

The black-bellied antwren is 12 to 14 cm (4.7 to 5.5 in) long. Adult males of the nominate subspecies have a wide white supercilium that extends down the neck, along the side of the breast, and widens on the flanks. Their crown and upperparts are dark grayish brown with white edges on the outer scapulars and a hidden white patch between them. Their wings are blackish with white tips on the coverts. Their tail is black with white feather tips that increase in size from the central to the outer feathers. Their face, throat, and underparts are black with white underwing coverts. Voice: The black-bellied antwren's song is a "slow series of high, nasal 'tjew' notes (2/sec over 8 sec)". Its calls may vary geographically and include "a short series of complaining squeals...also sharp high-pitched 'seek' notes and lower-pitched, short downslurred notes".