This photo was taken this January in Yellowstone National Park. It was a cold, snowy, cloudy day. Good light for photographing bison. This herd was traveling down one of the groomed park roads. I was in a snow coach. I popped out of the top of the coach and began shooting. It is not common to get the opportunity to photograph a herd of bison in such a setting. I shot at a speed that was slow enough to get the action of the snow falling and the exhaled breath of the bison on the far left. I spent ten hours that day photographing and this is my favorite photo from the day.