E-Mail IMAGE: Wildlife biologists at the University of California, Berkeley, combined GPS location data of tagged mule deer and pronghorn antelope with satellite imagery of Wyoming fences to find out just how... view more Credit: Image courtesy Wenjing Xu Berkeley -- Each year, thousands of migratory mule deer and pronghorn antelope journey northwest from their winter homes in the Green River Basin, a grassland valley in western Wyoming, to their summer homes in the mountainous landscape near Grand Teton National Park. But to reach their destination, these ungulates must successfully navigate the more than 6,000 kilometers (3,728 miles) of fencing that crisscrosses the region. That's enough distance to span nearly twice the length of the U.S.-Mexico border.