Primate Mandibles (IMAGE) University of California - Berkeley Caption A collage of mandibles from extant and extinct Old World monkeys and apes that were included in the study. Credit Leslea Hlusko, UC Berkeley 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.