Black Antbird
Cercomacroides serva
The black antbird is 13.5 to 15 cm (5.3 to 5.9 in) long and weighs 15 to 17 g (0.53 to 0.60 oz). Males are almost entirely blackish to dark gray. They have a white patch between their scapulars, a small hidden white patch under the scapulars, gray edges on their flight feathers, and white tips on their wing coverts. Females have an olive-tinged dark gray crown, upperparts, wings, and tail with a small white interscapular patch. Their wing coverts and the edges of their flight feathers have a yellowish brown tinge. Their underparts are reddish brown to reddish yellow-brown. Voice: The male black antbird sings "a series of 4–7 countable...sharp notes rising in pitch and accelerating slightly" that has been written as "wor, chur, cheh-cheh-che-che-chi-chi-chi?". Females reply with a song that is "similar but lower-pitched and often followed by 2–4 soft abrupt notes". The species' calls include "a short to moderately long (e.g.
ID text from Wikipedia, CC BY-SA 4.0

Parker's Antbird
Cercomacroides parkeri
Parker's antbird is 13.5 to 15 cm (5.3 to 5.9 in) long. Males are almost entirely slate gray, with somewhat lighter underparts than upperparts. They have a hidden white patch between their scapulars and narrow white tips on their wing coverts and outer tail feathers. Their flanks have an olivaceous tinge. Females have an olive brown or olive brown tinged gray crown and ear coverts, a paler olive brown supercilium, and gray lores. Their upperparts, wings, and tail are olive brown. They have a very small or no interscapular patch. Their throat and underparts are tawny buff or cinnamon rufous. Voice: The song of the male Parker's antbird is "a muted note followed by higher-pitched, more intense series initially flat in pitch, then descending and accelerating as final notes shorten". Female song is shorter and has a higher pitch and downslurred notes. Its calls include "a rapid sputter of notes and a short, nasal, descending note".
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 Antbird and Parker's Antbird.