The lawsuit is separate from a lawsuit filed by 12 other groups this month. Both lawsuits have been filed in Montana and allege that the U.S. Fish and Wildlife Service did not follow its own guidelines in implementing a wolf-management plan that strips Yellowstone-area wolfs of endangered-species protection while handing oversight chores to Idaho and Montana. (Protections continue for wolves in Wyoming.) The groups claim the resulting state plans will reduce the current wolf population from 1,500 to roughly 300 in the two states. The plan was initially proposed by the Bush Administration and then carried out by the Obama Administration.