Brown-headed cowbirds (Molothrus ater) lay their eggs in other birds' nests, a behavior called nest parasitism. When this strategy succeeds, the host birds accept the cowbird egg as one of their own and rear the cowbird chick. When it fails, the host birds recognize the cowbird egg as an imposter and eject it from the nest. Why do any host species accept cowbird eggs in their nests? Given the obvious cost of rearing a chick of another species, acceptance seems maladaptive. Evolutionary biologist
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