Ecology and Management of Cowbirds and Their Hosts: Studies in the ... - Google Books

https://books.google.de/books?id=0xGCBAAAQBAJ&pg=PT139

In the past two centuries, cowbirds have increased in numbers and extended their range across North America, while many of the native songbird species whose nests they parasitize to raise their young have declined. This timely book collects forty essays by…