Does a cuckoo know it's a cuckoo? The answer is more difficult than you might think, explains Richard Pallardy ...
A migrant bird that winters in South America and summers in the American West is bound for extinction, according to a federal agency, which is seeking comments on a proposed endangered listing for the ...
Nest building is costly. It requires time, energy, and constant defence from predators. For birds that raise their own young, this investment makes sense because it ensures survival of their chicks.
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