As hard as it is to photograph Sheep, you should try Goats. The Goats hang out where the Sheep can't get to. Come to think of it, most animals here in Alaska are hard to get to. Polar Bears, MuskOx, Bison, Sheep, Goats, Walrus, etc. You haven't lived until you have camped out at Delta Junction at -50F so you can try to get a photograph of a Bison (the last remaining wild herd in USA) and yes I have done that. Staying warm is the easy part. Trying to sleep with cameras, lenses, water bottles and batteries in the sleeping bag is an adventure in itself.