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Brown-headed Cowbirds are a smaller, stocky blackbird with a shorter tail and thicker head than most blackbirds. Juveniles are plain gray-brown with some streaking on the chest.
"You’ll find Brown-headed Cowbirds in many open habitats, such as fields, pastures, meadows, forest edges, and lawns" Rather than build their own nests, the females lay eggs in other birds' nests, sometimes destroying the host's own eggs.