Yellowstone bison: Why are bison managed differently from other wildlife and not allowed to move freely into Montana and disperse to new areas?

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From the National Park Service

 

Why are bison managed differently from other wildlife and not allowed to move freely into Montana and disperse to new areas?

  • Yellowstone bison are managed differently than other wildlife that migrate or disperse outside the park because the Secretaries of Agriculture and Interior and the Governor of Montana signed a court-mediated agreement in 2000 that provided guidelines for limiting bison abundance and distribution in Montana.
  • Yellowstone bison have been chronically exposed to the non-native disease brucellosis that can be transmitted to cattle and cause them to abort calves. As a result, bison are not allowed to move unimpeded into cattle-occupied areas in Montana.

 

 

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