Bull Elk, Yellowstone National Park, WyomingI captured this guy years ago in May, when bull elk are growing a new set of antlers, one of the fastest-growing tissues in the animal kingdom. At the same time, they’re shedding their thick winter coats, leaving them looking a bit ragged as they transition into summer and prepare for the fall rut months ahead. Despite the appearance, however, I think this guy was feeling pretty good about himself. Nikon D700 with Nikkor 70-200mm lens (at 102mm) ISO 800, f/4 at 1320th of a second.