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Brown-Headed Cowbird

Molothrus ater

Cowbirds are well known nest parasites. It is thought by some theorist that it evolved this practice when it used to follow the great bison herd migrations that roamed freely from present day Mexico to Canada. To keep up with the migration, these birds would deposit their eggs in other bird’s nests. Their young develop much faster than that of their hosts, so the host’s offspring do not survive.

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