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.
Bison Path over Boardwalk Old Faithful Area, Yellowstone National Park, Wyoming
This looks like the paths bison make through deep snow except this went right across the boardwalk. - February 03, 2011 - 1/500 sec at f / 11 - 18 mm - ISO 200 - 44°27'53" N 110°49'47" W