The wind and cold don’t bother this muskox. Its long, coarse outer fur keeps it waterproof and windproof. Its underfur, qiviut, traps its body heat to keep it very warm. Muskoxen are one of the only large animals hearty enough to survive year-round in the Arctic. Although their populations have fluctuated over the last century, today they number around 3,800 in Alaska -- many of them in Bering Land Bridge National Preserve. Photo by National Park Service.