YELLOWSTONE, USA - AUGUST 18: bison on August 18, 2007 in Yellowstone: jam on the highway due to the presence of bison. The road kills of bison pose a serious problem in the park.
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YELLOWSTONE, USA - AUGUST 18: bison on August 18, 2007 in Yellowstone: jam on the highway due to the presence of bison. The road kills of bison pose a serious problem in the park.