Shaggy mule deer (IMAGE) University of Wyoming Caption Mule deer in Wyoming have a shaggy appearance as they seek to recover from the long winter months on Seedskadee National Wildlife Refuge. A 14-year study in Wyoming’s Atlantic Rim region quantified how energy development in migration corridors causes a 38.65 percent reduction in mule deer ability to track the best springtime forage -- a clear mechanism for reducing the benefit of migration -- which can result in population declines. Credit Tom Koerner/U.S. Fish and Wildlife Service Usage Restrictions No restrictions. License Public Domain 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.