Mule deer are increasing in the park, as well as in the rest of Jackson Hole. Though quite shy, they are often seen along the many miles of trail which are accessible to both rider and hiker. The elk, or wapati, have been the most important of the big game animals in Jackson Hole, at least since the occupancy of white men; and they have done much to make the valley known to the world. Their history constitutes one of the most interesting chapters in the story of the valley. Not many years ago as the winter range of the elk was more and more taken up by the cattleman and rancher, depriving the elk of the areas where they might find winter forage not too deeply covered by winter snow, it became apparent that something must be done to save these magnificent animals. Toward this end a Government ranch was established near the town of Jackson, where the elk could be fed during the winter months. The preservation of the Jackson Hole elk herd is now assured. In the spring elk leave the low country and the Government feed grounds and move toward the high country in Yellowstone Park and south of it, on Big Game Ridge, the Thorofare Plateau, and in the mountains east of Jackson Hole. A small herd summers in the north end of the Teton Range. With snowfall in the high country, the elk again move down until by November or December they are back on the feed grounds. A small herd of bighorns, or Rocky Mountain sheep, ranges in the Teton Mountains. Large numbers of bighorns are found, however, in the mountains east and south of Jackson Hole. In the park there are many smaller mammals, among them the marmot, or "rockchuck", whose shrill whistling makes his presence known at all altitudes from the valley floor to the peak summits. Marmots make interesting pets, and tame ones are not uncommon. Like bears, marmots hibernate through the winter. Conies (pikas) are common throughout the rock slides, where these little animals find numerous refuges. They are guinea-piglike creatures, usually grayish in color and 7 or 8 inches long. In the rock slides one may find the little hay piles which they make of the plants growing nearby. Though very little is known concerning the winter habits of these alpine animals, it is probable that they do not hibernate but during the winter live on their stored hay and what additional food is to be found under the snow. Bears are found only in the mountains and canyons of the park. _They do not invade the campgrounds._ [Illustration: BULL ELK _Photo by Crandall._] That most interesting of smaller mammals, the beaver, is common, and it is not difficult to find the houses and dams which they have built. In the campgrounds are pine squirrels, chipmunks, ground squirrels, and mice. Mink, marten, otter, weasels, coyotes, badgers, fox, and lynx also are found in the park.