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

Males have bright yellow feathers covering most of their bodies, with a reddish-brown “cap” atop their heads during the breeding season. They are territorial birds that defend their turf from ...

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 ...

Generally shy and elusive, the yellow-billed cuckoo can be easily overlooked. Its calls are usually loud and often provide the best evidence to the presence of the bird. It favors eating ...