Environmental groups have filed a third federal lawsuit challenging the U.S. Fish and Wildlife Service's move to end federal protections for wolves in Wyoming. The Humane Society of the United States and the Fund for Animals filed suit today/yesterday in U.S. District Court in Washington, D.C. The groups say Wyoming's management plan classifying wolves as predators that can be shot on sight in most of the state is inadequate. They want the court to reinstate federal protections.