_The Prairie Marmot_, commonly called Prairie Dog, builds his dwelling in the barren tracts of the western country, and may often be seen sitting by the small mounds of earth, which indicate his abode, in an attitude of profound attention. Whole acres of land are occupied by these little tenants, and villages are found, containing thousands of inhabitants. Near the Rocky Mountains, these villages are found to reach several miles. The burrow extends under ground, but to what distance has not been determined. This marmot, like the rest of the species, remains torpid during the winter. It is very much annoyed in its habitation by owls, rattlesnakes, lizards, and land tortoises, who appropriate these comfortable dwellings for their own use, and frequently destroy the young marmots. The _Fox Squirrel_ is found throughout the southern states, where it frequents the pine forests in considerable numbers, and derives its principal subsistence from the seed of the pine. Its color varies from white to pale gray and black, and is sometimes mottled, with various shades of red. The _Cat Squirrel_ is one of the largest species, and is found in great abundance in the oak and chesnut forests of this country. It is a very heavy animal, and is slow in its movements, seldom leaping from tree to tree, unless it is alarmed or closely pursued. It is found of almost every variety of color. The _Black Squirrel_ is very common, but is often confounded with the black varieties of the squirrels before described. In the winter, this animal is of a pure black; in the summer, it is of a grayish black, intermingled with a dark reddish brown. It is found in the United States, and inhabits the northern shores of Lakes Huron and Superior. Illustration: Black Squirrel. The _Common Gray Squirrel_ is remarkable for its beauty and activity, and is common throughout the United States. It is generally found in hickory and chesnut woods, where it feeds on nuts, and lays up a hoard for the winter. It is very easily domesticated, and in captivity is very playful and mischievous. The _Great-tailed Squirrel_, so called from the length of its tail, is common on the Missouri. It is of a grayish black color, and is very graceful and active. The _Line-tail Squirrel_ inhabits the Missouri country, where it builds its nest in the holes and crevices of rocks. It is fond of the naked cliffs, where there are but few bushes, and very rarely ascends a tree. It feeds on the buds, leaves, and fruits of plants. It is of an ash color, intermixed with white hairs. Its fur is coarse, and the tail, which is very long, is marked with three black lines on each side. The _Four-lined Squirrel_ is found on the Rocky Mountains. Its nest is composed of a great quantity of the branches of different kinds of trees, and of other vegetable productions. It does not ascend trees by choice.