Black-throated Antbird
Myrmophylax atrothorax
The black-throated antbird is 13 to 14 cm (5.1 to 5.5 in) long and weighs 14 to 18 g (0.49 to 0.63 oz). Adult males of the nominate subspecies M. a. atrothorax have a gray face. Their crown and upperparts are dark yellowish olive-brown that becomes blackish on the rump, with a white patch between the shoulders. Their tail is blackish gray. Their wings are dark yellowish olive-brown with black and white tips on the coverts. The center of their throat and breast are black and the rest of their underparts gray. Voice: The black-throated antbird's song is a "very high, slightly decelerating series of 4-8 very sharp 'chee' notes, starting with a stuttered 'tutu', then slightly rising in strength and in pitch, together as 'tutu-chee-cheé- -' ". Its calls include a "sharply downslurred...note" and a "mixture of abrupt 'chit' notes given in short bursts mixed with moderately long...flat whistles".
ID text from Wikipedia, CC BY-SA 4.0

Peruvian Warbling Antbird
Hypocnemis peruviana
The Peruvian warbling antbird is 11 to 12 cm (4.3 to 4.7 in) long. Adult males of the nominate subspecies have a black crown with a white central streak and a white supercilium on an otherwise black and white speckled face. Their upperparts are grayish brown with a white patch between the scapulars and much black and white speckling. Their rump is rufous. Their flight feathers are brown with yellowish olive-brown edges and their wing coverts black with white tips. Their tail is brown with pale buff tips to the feathers. Their throat and breast are white with many dark spots. Voice: The male Peruvian warbling antbird's song is "not at all warbling...a raspy, almost snarling 'peér, peer-peer-peer-peer-pur-pur-pyur' with descending effect". Females reply with a "shorter, higher-pitched version" that may start during the male's song. Both sexes give "wur-cheeé or wur-cheeé-cheeé" calls.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black-throated Antbird and Peruvian Warbling Antbird.