Black-capped antwren

The black-capped antwren ("Herpsilochmus atricapillus") is a species of bird in the family Thamnophilidae.
It is found in Argentina, Bolivia, Brazil, and Paraguay.
Its natural habitats are subtropical or tropical dry forests and subtropical or tropical moist lowland forests.
The black-capped antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name "Herpsilochmus atricapillus".