Last month, the U.S. Fish and Wildlife Service listed the meadow jumping mouse as an endangered species. Now, the U.S. Forest Service, which oversees the Santa Fe National Forest, is considering erecting a series of 8-foot high fences to protect the mouse’s habitat. The Luceros, members of the San Diego Cattleman’s Association and holders of grazing permits with the federal government, say the fences will lock out their cattle — as well as those of other permit holders — from ever returning to the meadow where the livestock graze for 20 days in the spring and up to 40 days...