<i>Pelagiarctos thomasi</i> Fossil (IMAGE) University of Otago Caption Artist restoration of the head of Pelagiarctos thomasi, a fossil walrus from California. Once thought to be a "killer walrus" that ate marine mammals, new tooth enamel research is bolstering the case that it likely had a diet similar modern New Zealand fur seals and sea lions. Credit Robert Boessenecker 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.