Migrating mule deer (IMAGE) University of Wyoming Caption Mule deer move across a sagebrush-covered basin in western Wyoming, where new research by University of Wyoming scientists challenges the long-held assumption that animals match offspring birth with the peak green-up of forage at the birth site. 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.