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
Barred Antshrike
Thamnophilus doliatus
The barred antshrike is 15 to 18.5 cm (5.9 to 7.3 in) long and weighs 24 to 32 g (0.85 to 1.1 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 bushy crest. Adult males of the nominate subspecies T. d. doliatus are almost entirely plumaged with alternating black and white bars. The black bars on their upperparts are thicker than the white bars; on their underparts the black bars are thinner than the white ones. Voice: Both sexes of the barred antshrike sing; while singing they stretch their neck, bow forward, and pump their tails up and down. Males erect their crest, which shows the feathers' white bases in the subspecies that have them.
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 Barred Antshrike.