Polytypic (4 named ssp ... the Wilson’s warbler is the only other bright yellow species with a black cap, but it does not have the finchlike bill or the bold wing pattern of the American.

Polytypic. Length 5.8". The species has a black crown and nape that contrast with a white face and breast. Adult male: It has a uniformly black crown and nape. Upperparts are blue-gray ...