Female cowbirds (Molothrus ater ater), maintained in isolation from males during the breeding season, respond to the playback of male song with copulatory postures. They respond to some songs more ...

The published observations of egg-laying (six instances) and of egg-removal (eight instances) by the Cowbird (Molothrus ater) are summarized. A female Cowbird carried off and ate a Song Sparrow egg at ...