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This May 2020 photo provided by the Voyageurs Wolf Project shows Wolf V092 during efforts to fit a GPS-collar, just south of Voyageurs National Park, Minn. Scientists studying gray wolves in the park have traced how wolves preying on beavers affect the ecosystem by impeding the ability of beavers to build and maintain new dams that create wetlands. (Tom Gable/Voyageurs Wolf Project via AP)

This May 2020 photo provided by the Voyageurs Wolf Project shows Wolf V092 during efforts to fit a GPS-collar, just south of Voyageurs National Park, Minn. Scientists studying gray wolves in the park have traced how wolves preying on beavers affect the ecosystem by impeding the ability of beavers to build and maintain new dams that create wetlands. (Tom Gable/Voyageurs Wolf Project via AP)

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