BOISE, Idaho (AP) — The U.S. Forest Service is illegally jeopardizing a small herd of bighorn sheep with deadly diseases by allowing thousands of domestic sheep to graze in eastern Idaho as part of agricultural research activities, environmental groups have said in a lawsuit. Western Watersheds Project and WildEarth Guardians in the lawsuit filed Tuesday contend the grazing of sheep owned by the University of Idaho via permits issued to the U.S.