Does a cuckoo know it's a cuckoo? The answer is more difficult than you might think, explains Richard Pallardy ...

Bird eggs range in colors and can be ornately maculated with spots, blotches and scrawls. They vary in shape and size, and they must be thick enough to withstand the weight of an incubating parent but ...

While most birds carefully nurture and protect their young, some species have evolved a more unconventional approach. Known as "brood parasites," these birds lay their eggs in the nests of other ...

The first wild eggs of an endangered bird have been laid for the first time in almost four decades, and the Cincinnati Zoo & Botanical Garden helped to play a role!The zoo says Sihek, an endangered ...

Add Yahoo as a preferred source to see more of our stories on Google. A bird once declared extinct in the wild has just laid eggs in Hawaii. The sihek, also known as the Guam kingfisher, has a ...