When red-billed and yellow-billed finches mate, their offspring have orange bills. By studying the exact shade of orange in ...

Unstreaked. The male is unlike any other finch in North America; 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 ...

Monotypic (smaller, darker resident birds in southern Appalachians sometimes ... and the back is more extensively scalloped with yellow-buff. Adult male: forecrown, chin, and throat red, outlined ...