Elephant seals (IMAGE) University of California - Santa Cruz Caption Researchers found that as the density of an elephant seal breeding colony increases, the size of the pups at weaning declines, and this effect is more pronounced for younger females. Credit Photo by Daniel Costa Usage Restrictions For use only with news coverage of this research License Original 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.