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Brood parasites are organisms—usually birds—that manipulate a host, either of the same or a different species, into raising their young. The parasitic parent avoids the effort of rearing young by abandoning its eggs in the nest of a host bird. After hatching, the parasitic nestlings may kill or crowd out the host’s own offspring. The host will often continue to feed and care for the invasive chicks even when they do not resemble its young and may physically dwarf the host itself. Why? Discuss
Source: The Free Dictionary