Bertoni's Antbird

Bertoni's antbird is 12.5 to 13.5 cm (4.9 to 5.3 in) long; one individual weighed 10 g (0.35 oz). Adult males have a black crown, a white supercilium, a wide black band through the eye, and white cheeks with black speckles. Their upperparts are mostly reddish yellow-brown with few black feathers, a (usually hidden) white patch between the scapulars, and a rufous rump. Their wings are brownish black with paler edges on the flight feathers and wide white tips on black coverts. Their tail is dark brown to blackish brown with wide white tips on the feathers. Voice: The song of Bertoni's antbird is a "series of about 6-10 thin, sharp notes, starting very high, descending steeply, and accelerating to drawn-out last two notes". It has been written as "cheep cheep cheep chip chip chewy chewy". Its calls "include long ...somewhat harsh and complaining notes in short series of 4–6, similar but harsher and longer...notes in triplets".