The recovery of the gray wolf in the Rocky Mountain West is one of the Endangered Species Act’s great success stories. Hunted nearly to extinction, wolves were reintroduced to the region in the 1990s and have since staged a remarkable comeback, thanks to federal protections. But whether this story has a happy ending will depend on the federal government’s willingness to monitor, and revise if necessary, wolf management plans it has agreed to in Idaho and Montana and is about to strike with Wyoming.