Black-crowned Antshrike
Thamnophilus atrinucha
The black-crowned antshrike is 14 to 15 cm (5.5 to 5.9 in) long and weighs 20 to 28.5 g (0.71 to 1.0 oz). Members of genus Thamnophilus are largish members of the antbird family; all have stout bills with a hook like those of true shrikes. This species exhibits significant sexual dimorphism. Adult males of the nominate subspecies have slaty gray upperparts with a gray forehead, a black crown and nape, a hidden white patch between their scapulars, and white-tipped black uppertail coverts. Their face is grizzled gray. Voice: The black-crowned antshrike's most common song is "a series of uh notes ending with a single erk at a higher pitch". Both sexes sing, commonly in the morning but at any time of day. The song has been written as "wur wur wur-wur-wur-wur'wur'wur'wur; AH" and "anhanhanhanhanhanhanhanhanhánh". Its calls include "a 1–4-note (usually 2) caw arr-arr and a bark-rattle: arr-grr'r'r'r".
ID text from Wikipedia, CC BY-SA 4.0
Chestnut-backed Antbird
Poliocrania exsul
The chestnut-backed antbird is 14 to 15 centimetres (5.5 to 5.9 in) long and weighs about 29 grams (1.0 oz). Both sexes of all subspecies have a pale blue patch of bare skin around each eye. Adult males of the nominate subspecies P. e. exsul have a slate-black head and neck. Their upperparts are deep chestnut. Their wings and tail are deep chestnut with some black and white on the wing coverts. Their throat, breast, and belly are blackish slate and their flanks, vent area, and undertail coverts are brown. Voice: The chestnut-backed antbird's song is "an easily recognized and imitated set of 2–3 whistled notes, 'peh, peeea' or 'peh, phe, peeéa'...paraphrased as 'come...here' or 'come...right...here' ". Others have written it as "drink beer! or drink more beer!". Its calls include "rah, didit, and pew".
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-crowned Antshrike and Chestnut-backed Antbird.