Juvenile California Sea Lion Brain (IMAGE) Vanderbilt University Caption California sea lions have brains about the size of chimpanzees but they are organized much differently. Credit Eva Sawyer, Vanderbilt University Usage Restrictions None 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.