Fascinating animals, muskoxen look like survivors of the Ice Age. Whiles other arctic animals spend their winter in hibernation, muskoxen live in open, unsheltered tundra enduring the unforgiving elements that come their way. One secret to muskoxen survival is their two layers of fur – a very long outer layer of fur that looks like hair and a short fuzzy underlayer of qiviut. You can find muskoxen on several public lands in Alaska, including Cape Krusenstern National Monument. Photo by Doug Demarest, National Park Service.