Using field experiments in Africa and a new computer model that gives them a bird's-eye view of the world, scientists have discovered how a bird decides whether or not a cuckoo has laid an egg in its ...

Most birds spend hours, days, or even weeks painstakingly building their nests. Some birds make nests out of mud, some build nests in trees, and some birds nest on the ground and simply scrape out a ...

Birders are going cuckoo for a rare sight on Long Island. The common cuckoo bird has been spotted only four times in U.S. history in the lower 48 states, experts say. Now, it's in Riverhead. Hundreds ...