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This undated photo provided by Arizona Game and Fish Department shows Bison roaming along the northern reaches of the Grand Canyon. The bison were introduced to the area in 1906 as part of a ranching operation to crossbreed them with cattle. The state of Arizona owns and maintains the bison on land outside the national park, but the animals have been spending a majority of their time within Grand Canyon boundaries causing headaches for park staff. (AP Photo/Arizona Game and Fish Department)

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