Female Elephant Seal with Pup (IMAGE) University of California - Santa Cruz Caption Elephant seal milk, which can be seen on this female with a pup about 3 weeks old, is 55% fat. The females rely entirely on stored energy reserves during the four weeks they spend nursing their pups on the beach. Credit Burney Le Boeuf Usage Restrictions For use only with news coverage of this research. 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.