There's nothing like a good shake after a roll in the dust and this bison was enjoying it to the fullest. Bison facts: By the middle of the 1800's the bison was extinct east of the Mississippi, and by 1900 there remained only two wild herds in North America, one of plains bison in Yellowstone Park, and one of the larger variety, called wood bison, in Canada. Protective laws were passed beginning at the end of the last century, and the bison population has since risen from a few hundred to many thousands. The wood bison may have vanished as a distinct race through hybridization with the plains bison. ~ encyclopedia.com

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