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Cowbirds are a destructive bird. They will lay their eggs in other birds nests and their eggs hatch first, which allows the chicks to push out the other chicks and eggs and get the nest to itself.
In some wooded areas they are helping wipe out the native bluebird populations by having the bluebirds raise cowbird chicks, thus reducing the number of bluebirds every time they nest.
I love watching the birds when they are "courting" a potential mate, and also when they are feeding their fledglings.
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