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Chipmunks may be classified either as a single genus, Tamias, or as three genera: Tamias, of which the eastern chipmunk (T. striatus) is the only living member; Eutamias, of which the Siberian chipmunk (E. sibiricus) is the only living member; and Neotamias, which includes the 23 remaining, mostly western North American, species.
During the winter, the chipmunk may enter long periods of hibernation. [22] Predators of the eastern chipmunk include hawks, owls, foxes, raccoons, snakes, weasels, coyotes, bobcats, lynx, domestic dogs and domestic cats. On average, eastern chipmunks live three or more years in the wild, but in captivity they may live as long as eight years. [16]
Even though the Siberian chipmunk normally grows to 50–150 g (1.8–5.3 oz). [3] [5] The Siberian chipmunk does not exhibit sexual dimorphism, and size and body proportions are the only way to distinguish younger chipmunks from older ones. [4] Its small size may contribute to its relatively short life from two to five years in the wild.
Columnist Mike Lunsford says chipmunks are a tiny force of nature.
The yellow-cheeked chipmunk is the largest species in the genus Neotamias and grows to a total length of 233 to 297 mm (9.2 to 11.7 in) including a tail of 97 to 130 mm (3.8 to 5.1 in). It is a dark, tawny olive with five dark longitudinal stripes on the body, the central one along the spine being the most prominent, and three on the head ...
The gray-collared chipmunk grows to a total length of about 225 mm (9 in) including a tail of around 98 mm (4 in). The forehead is greyish-brown and the side of the head bears three dark stripes, the central one of which passes through the eye. These are separated by bands of white. The cheeks, neck, shoulders, upper back, and rump are grey.
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The Uinta chipmunk is a medium-sized chipmunk, with adults ranging from 20 to 24 cm (7.9 to 9.4 in) in length, including the tail at 7 to 11 cm (2.8 to 4.3 in), and weighing an average of 67 g (2.4 oz). The predominant color of the summer coat varies from yellowish brown-grey to dark brown, often with a reddish tinge.