FILE - In this May 24, 2017, file photo, a bison munches grass in Theodore Roosevelt National Park in western North Dakota. From historical details of Native Americans' final great wild buffalo hunts to tales of the animal's rescue from near extinction, a new self-guided tour across 10 sites in the western Dakotas tells the story of the last stand of the American bison, the national mammal. The trail, which is accompanied by the tour book "Buffalo Trails in the Dakota Buttes" oriented toward history enthusiasts, officially opens June 11. (AP Photo/Blake Nicholson, File)
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