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Chipmunks are 25 species of small mammals in the order Rodentia, the rodents. Specifically, they are classified with the squirrel-like rodents, the Sciuridae. Chipmunks are traditionally placed into a single genusTamias. More recently, taxonomists have proposed splitting this single genus into three genera Tamias, Eutamias, and Neotamias.

North America is home to 17 species of chipmunk, 16 in the West and only one, Tamias striatus, the eastern chipmunk, in the East. The eastern chipmunk is about 5-6 in (12.7-15 cm) long, and the tail adds another 4 in (10 cm) or so to the animals length. They have stripes on their face and along the length of their body. In all species the tail is bushy, although not quite as bushy as the tails of treesquirrels. Their eyes are large, their vision is excellent, and their sensitive whiskers give them a well-developed sense of touch.

Like other squirrels, chipmunks are opportunists, making a comfortable home where other animals would not dare. They are generally unafraid of human beings, and are frequent visitors to campgrounds. They are burrowers, digging holes among rocks, under logs, and within scrub, to make a burrow as long as 15 ft (4.6 m) and extending downward about 3 ft (0.9 m).

Like squirrels, chipmunks are active during the day. They emerge from their burrows in the morning to forage on mushrooms, fruits, seeds, berries, and acorns. Chipmunks will store food, particularly items with a long shelf-life, in their cheek pouches for transport back to the burrow. The Siberian chipmunk can carry more than a quarter of an ounce of seed for half a mile. This food is stored in an underground larder, which can contain between 4.5 and 13 lb (2-5.9 kg) of food. Chipmunks do not hibernate like bears; instead they become more lethargic than normal during the winter months.

In the spring, the female bears a litter of pups, numbering up to eight, which are born naked, toothless, and with closed eyes. The young grow quickly and are weaned at five weeks, but stay with the female for several months.

Chipmunks can live as long as five years, providing they avoid predators such as weasels, owls, hawks, bobcats, pine martens, and coyotes. Many chipmunks die after eating rodenticide set out for rats; these poisons have effectively eliminated chipmunks in some locations.