The woodchucks (genus Marmota) are found over most of the United States, well into Canada, and in the west north into Alaska. The Cascade hoary marmot occurs in the northern Cascade Mountains from Mount Rainier northward into southern British Columbia. On Mount Rainier the whistler is abundant in the rock slides from about 5,000 feet to forest line and above. Occasionally the alpine parks and meadows are chosen habitats; the animals are common in the Paradise Valley and on the open slopes above Alta Vista. A piercing, far-carrying whistle is often the park visitor’s introduction to the marmot or rockchuck of Mount Rainier. A careful scrutiny of the nearby terrain will often be rewarded by the sight of one or several of these animals, old and young, perched on a rock above the entrance to the burrow, or galloping clumsily but swiftly toward home and safety. It is usually possible to continue the acquaintance at closer range, particularly if the observer approaches slowly and the animals are in areas where they have become accustomed to having human visitors in their neighborhood. The whistler is almost strictly vegetarian in his food habits, feeding upon green succulent vegetation in the near vicinity of the burrow. It is common to find well-beaten paths from the animal’s “front door” to the forage areas. Moving about on a grassy slope the fat, lazy rodent seems anything but alert, as he crawls from one spot to another. But the observer soon becomes aware that the chuck’s pauses to survey the landscape are frequent; his head is raised, if no danger threatens his tail flips and feeding is resumed. If frightened, swift retreat is generally preceded by the shrill whistle, and the sluggish, crawling fat one becomes a scurrying bundle of fur following a well-worn and familiar route to the sanctuary of his den. The marmot is a sun-worshiper. After an early morning feeding period, it is his custom to sprawl, rug-like, on a favorite rock slab, sometimes for hours, resting and obviously enjoying his sun-bath. Chucks are rarely abroad for any extended length of time on cloudy, drizzly days. They may appear if driven out by hunger, but seem to prefer the warmth and comfort of the den during inclement weather. The hibernating period of the marmot begins in September and lasts well into spring, the time of emergence is usually late in April. There is no evidence that any food is stored, and for some time after coming out of hibernation the animals may travel a considerable distance over the snowfields in search of open ground and green vegetation. The famous naturalist, Ernest Thompson Seton, has well expressed the marmot’s way of life: “Convincing evidence there is that, during lethargy—the little death of the winter sleep—the vital functions are suspended—the sleeper neither grows, suffers, wastes, nor ages. He did not lay up stores of food; yet, in the spring, he comes out just as fat as he went in the fall before.