For hosts of brood parasitic birds, the costs of parasitism range from diminished nestling growth rate, due to competition with larger and more competitive parasitic offspring (cowbirds ...

Research on brood parasites usually focuses on the evolutionary arms race between host and parasite, but findings published this week in Nature highlight the importance of a broader perspective. The ...

She then swallows one of the eggs that’s been laid there and lays one of her own—a behavior known as brood parasitism. Sometimes potential victims revolt. The parents that inhabit the nest may ...