Started out in Bozeman, stayed a first night in Mammoth Hot Springs, stayed several days around Old Faithful, and then back to the Mammoth Hot Springs area for the Wolf Discovery tour.
Snow Capped Bison Old Faithful Area, Yellowstone National Park, Wyoming
The guide mentioned how good their insulation must be to not melt the snow. - February 05, 2011 - 1/1250 sec at f / 5.6 - 110 mm - ISO 200 - 44°32'9" N 110°49'1" W