Wildlife photography of a bull Bison in Winter on the frozen bank of Soda Butte Creek in Yellowstone National Park

A solitary bull Bison encrusted with frost, gazes on as a January sunrise glints off Soda Butte Creek and temperatures struggle to move above –35°F in the Lamar Valley of Yellowstone National Park. Supremely adapted to the near-arctic Winters of northwestern Wyoming, research shows that Bison do not start to get cold until temperatures fall below –40°F. This one is likely looking to the dawn for relief from the cruel night before.