Migrating Mule Deer (IMAGE) University of Wyoming Caption Mule deer move across a sagebrush-covered basin in western Wyoming. New University of Wyoming research shows that deer navigate in spring and fall mostly by using their knowledge of past migration routes and seasonal ranges. Credit Joe Riis 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.