Yellowstone National Park, January 2019: Bison, between Mammoth and Tower, Yellowstone National Park, January 31, 2019. [#9790-9230] Click on image for next photo.

Bison, between Mammoth and Tower, Yellowstone National Park, January 31, 2019.  Click for next photo.

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All photos 1998-2019 by Thomas O'Neil