Learn what an American goldfinch looks like and sounds like and what this bird eats. Also find out why goldfinches look different in winter.

This amazing little bird uses his wings to sing. Find out how the male club-winged manakin creates sound to attract a female.

“It was spectacular. This bird is in its nonbreeding [plumage], so in the spring when it’s in its breeding plumage, it’s going to be even more starkly male, female,” Lindsay says.

The females are a dull yellow-olive color with black wings and wing bars and are difficult to tell from the Lesser Goldfinch. Yellow-bellied sapsucker (male) (Photo: National Park Service) ...

A black-headed gull has a noisy, high-pitched call which includes a thin-sounding, drawn-out kaaww — and they also engage in ...

Researchers trapped this rose-breasted grosbeak at Powdermill Nature Reserve in September. Its yellow side is female, and its red side is male—a conditional called bilateral gynandromorphy.