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Chipmunks are classified as four 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; Nototamias, which consists of three extinct species, and Neotamias, which includes the 23 remaining, mostly western North American, species.
It has two fewer teeth than other chipmunks and four toes each on the front legs, but five toes on the hind legs. [16] The chipmunk's appearance "remains consistent throughout life. There is no external difference in appearance between the sexes except the obvious anatomical characteristics of the genitalia during periods of fertility.
Caged Tamias chipmunk, Tokyo area. The genus Tamias was formerly divided into three subgenera that, in sum, included all chipmunk species: Tamias, the eastern chipmunk and other fossil species; Eutamias, of which the Siberian chipmunk (E. sibiricus) is the only living member; and Neotamias, which includes the 23 remaining, mostly western ...
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.
The yellow-pine chipmunk (Neotamias amoenus) is a species of order Rodentia in the family Sciuridae.It is found in parts of Canada and the United States. [2]These chipmunks are normally found in brush-covered areas, and in California, they inhabit an elevation range of around 975 to 2,900 meters.
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 ...
Townsend's chipmunk (Neotamias townsendii) is a species of rodent in the squirrel family, Sciuridae. It lives in the forests of the Pacific Northwest of North America, from extreme southwestern British Columbia through western Washington and western Oregon. Townsend's chipmunk is named after John Kirk Townsend, an early 19th-century ...
This western American dweller is the largest of the three species of chipmunks found in the Colorado Front Range (which also include the Least Chipmunk and the Uinta Chipmunk). On average it weighs about 62 grams (2.2 oz). Chipmunks are distinguished from ground squirrels in that their faces have a stripe going across under the eye.