Golden-mantled Ground Squirrel (IMAGE) University of Michigan Caption Golden-mantled ground squirrel in Utah mountains and fossil squirrel jaw document high rodent diversity in topographically complex western North America today and 16 million years ago. Credit Squirrel photo by Catherine Badgley Fossil rodent jaw photo by University of California Museum of Paleontology (photo used with permission) Topographic pattern from MyTopo (used with permission) Usage Restrictions Fossil rodent jaw photo by University of California Museum of Paleontology (photo used with permission) Topographic pattern from MyTopo (used with permission) 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.