Some cowbirds make warblers an offer they can't refuse: Brood over my eggs, or I'll rough up your nest. Cowbirds are a parasitic species that lay eggs in the nests of other birds, called hosts, which ...

The observation of three brown-headed cowbirds a few days ago were the first we've ever seen in our yard. The range of these blackbird relatives has been expanding throughout North America this ...

During the late spring and early summer months when birds are nesting and watching over their eggs, you're apt to spot an unwelcome avian visitor in your backyard or neighborhood. Often lurking just ...

Fleischer, Robert C. and Smith, Neal Griffith. 1992. "Giant cowbird eggs in the nests of two icterid hosts: The use of morphology and electrophoretic variants to identify individuals and species." The ...

Scientists are trying to better understand how some baby birds are given up for adoption. To be more precise, some birds give up their eggs, leaving them for others to raise. Scientists who study this ...