THESE animals build their nests either in the hollow parts of trees, or near the bottom of thick shrubs, and line them most industriously with moss, soft lichens, and dead leaves. Conscious of the length of time they have to pass in their solitary cells, Dormice are very particular in the choice of the materials they employ to build and furnish them; and generally lay up a store of food, consisting of nuts, beans, and acorns; and on the approach of cold weather roll themselves in balls, their tail curled up over their head between the ears, and in a state of apparent lethargy pass the greatest part of the winter, till the warmth of the sun, pervading the whole atmosphere, kindles their congealed blood, and calls them back again to the enjoyment of life. Except in the time of breeding and bringing up its young, the Dormouse is generally found alone in its cell. This animal is remarkable for the very small degree of heat its body possesses during its torpid state, when it appears actually frozen with the cold, and it may be tossed or rolled about without being roused, though it may be quickly revived by the application of gentle heat, such as that of the hands. If a torpid Dormouse, however, be placed before a large fire, the sudden change will kill it. THE AMERICAN DORMOUSE, or GROUND SQUIRREL, is a very beautiful animal, striped down the back, and resembling the squirrel in its habits, except that instead of living in trees it burrows in the ground. [Illustration: THE MARMOT, OR ALPINE RAT. (_Arctomys Marmotta._)] THIS is a harmless, inoffensive animal, and seems to bear enmity to no creature but the dog. He is caught in Savoy, and carried about in several countries for the amusement of the mob. When taken young, he is easily tamed, and possesses great muscular power and agility. He will often walk on his hinder legs, and uses his fore paws to feed himself, like the squirrel. The Marmot makes his hole very deep, and in the form of the letter Y, one of the branches serving as an avenue to the innermost apartment, and the other sloping downwards, as a kind of sink or drain; in this safe retreat he sleeps throughout the winter, and if discovered may be killed without appearing to undergo any great pain. These animals produce but once a year, and bring forth three or four at a time. They grow very fast, and the extent of their lives is not above nine or ten years. They are about the size of a rabbit, but much more corpulent. When a number of Marmots are feeding together, one of them stands sentinel upon an elevated position; and on the first appearance of a man, a dog, an eagle, or any dangerous animal, utters a loud and shrill cry, as a signal for immediate retreat. The Marmot inhabits the highest regions of the Alps; other species are found in Poland, Russia, Siberia, and Canada. [Illustration: THE GUINEAPIG. (_Cavia Cobaya._)]