New migration maps serve as tools to help big game in West

Cheyenne, Wyo. • The life-or-death journey made by mule deer during the second-longest big game migration in North America came down to their ability to squeeze through a fence — a discovery made by scientists using wildlife GPS tracking techniques to map animal migrations in the West in unprecedented detail.The resulting atlas of migration corridors in Arizona, Idaho, Montana, Nevada, Utah and Wyoming published by the U.S. Geological Survey can help elk, mule deer, antelope and other