Which of the following statements is false about
brown-headed cowbirds?
a. They live as commensals with bison and cattle.
b. They are insect-eaters.
c. Females can lay thirty eggs in a season.
d. Cowbird hatchlings are recognized as imposters
by host parents.
e. They now parasitize at least fifteen species of
native North American birds.
Answer: d
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