Bighorn Ram, Yellowstone National Park, Wyoming
There were quite a few bighorn rams in Yellowstone this weekend. The ewes that I saw, on the other hand, were all just outside of the park. Rams and ewes only come together during mating season. The rest of the year the rams hang out in bachelor herds while the ewes hang out together and tend to the young. This guy was trudging through the snow looking for whatever vegetation he could find.
Nikon D800 with Nikkor 200-400mm lens (at 340mm) ISO 400, f/4 at 1/2500th of a second