YAKIMA, Wash. -- The brown-headed cowbird is bad news for other songbirds because it lays its eggs in the nest of other birds and takes no part in incubating its eggs or raising the young. This ...

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 ...

Charles Darwin described competitive interactions as one factor of natural selection and evolution, and present-day biologists usually emphasize this tenant whenever explaining basic, evolutionary ...