Warber and Cowbird Eggs (image) University of Illinois at Urbana-Champaign Share Print E-Mail Caption Cowbirds surreptitiously lay their eggs in other species' nests, leaving the care and feeding of their offspring to the unwitting hosts. The three larger eggs are cowbird eggs, laid in a prothonotary warbler's nest. Credit Photo by Jeff Hoover Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required: Jeff Hoover Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.