Colorado officials say they plan to sue if Interior Secretary Sally Jewell tries to list the Gunnison sage-grouse as endangered. The U.S. Fish and Wildlife Service has proposed the Gunnison sage-grouse for listing and will decide on the bird’s status by May 12. The Daily Sentinel reports there are about 4,000 of the birds in Colorado’s Gunnison Basin. Opponents say protecting the Gunnison sage-grouse would impose strict government restrictions on hundreds of thousands of acres.