brood parasitism

noun
a form of social parasitism practiced by certain birds, as cuckoos and cowbirds, in which eggs are laid in the nests of other birds, causing them to be hatched and the young reared by the hosts, often at the cost of the hosts' own young.
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Example sentences
One result of these changes has been an increase in rates of cowbird brood
  parasitism.
The yellow warbler, however, is not without its own defenses against brood
  parasitism.
The effect of aggregated nesting on red-winged blackbird nest success and brood
  parasitism by brown-headed cowbirds.
Cowbird brood parasitism is a natural part of the prairie ecosystem and has
  been for countless years.
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