Bar-crested Antshrike
Thamnophilus multistriatus
The bar-crested antshrike is 15 to 16.5 cm (5.9 to 6.5 in) long and weighs 21 to 23 g (0.74 to 0.81 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 marked sexual dimorphism though both sexes have a crest. Adult males of the nominate subspecies T. m. multistriatus are almost entirely plumaged with alternating black and white bars, including their crest. The exception is their face and throat, which are streaked black and white. Voice: The bar-crested antshrike's song is "much like Barred Antshrike but lazier with marked acceleration at end; typically 6-10 notes, dū, dü dü dü du du-du-da'da".
ID text from Wikipedia, CC BY-SA 4.0
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
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: Bar-crested Antshrike and Black-crowned Antshrike.