A new study is drawing attention to the possible extinction of an animal depicted in the animated film “Rio,” a story about two surviving blue macaws. The recently published study found that Spix’s ...

Somewhere over the rainbow 48 million years ago, a happy little blue bird flew—until it soared over a lake belching toxic gases and died. The lake’s sediments then entombed the bird’s body, ...

In Texas, biologists have documented an extraordinary bird — the natural hybrid offspring of a green jay and a blue jay. Once separated by millions of years of evolution and distinct ranges, the two ...