Sub Zero

Bull bison are the largest land mammal in North America, weighing up to a solid ton. They're all big, but when you see an exceptionally large one you get a true sense of just how massive these animals are. Here, on Soda Butte Creek in Yellowstone National Park on a morning when the temperature struggled to reach twenty below, a gigantic bull awaits the sun near a backdrop of frost-clad willows. Supremely equipped to handle this weather, he has changed very little in the past ten thousand years.  This photograph is available at several sizes on different media. Each size is limited to 11 copies, comes signed and numbered, and ships free to all lower 48 states.