Since the 1960s, biologists have made fake eggs for some studies of bird behavior. But Mark Hauber of Hunter College in New York says this kind of scientific handicraft is not exactly his forte. "With ...

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 ...

Be glad you’re not a cowbird, which is a type of blackbird. Mother cowbirds lay their eggs in other birds’ nests, making their offspring orphans even before birth. Sometimes the other birds where the ...

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 ...