Anis at Nest (IMAGE) Princeton University Caption Princeton researchers found that greater anis, which normally nest communally in groups of two to three females, can become social parasites and start laying their eggs in the nests of other groups after their own nests are destroyed. Credit Photo by Christina Riehl Usage Restrictions Use credit: Photo by Christina Riehl License Licensed content 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.