The park protects a variety of large mammals, including caribou, moose, grizzly bears, wolves, and dall sheep, a relative of the bighorn sheep. Smaller mammals, such as red squirrels, ground squirrels, shrews, voles, lemmings, foxes, weasels, wolverines, lynxes, martens, snowshoe hares, hoary marmots, pikas, porcupines.