Cowbirds lay their eggs in the nests of smaller birds. The fast-developing cowbird chicks hatch ...

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Cowbirds lay their eggs in the nests of smaller birds. The fast-developing cowbird chicks hatch first, then push the other baby chicks out of the nest as they hatch. The cowbird is classified as a
(a) pathogen.
(b) parasite.
(c) mutualist.
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