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  Rodentia · Sciuridae · Tamias merriami

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Tamias merriami

Merriam's Chipmunk

Order: Rodentia
Family: Sciuridae

Image of Tamias merriami
Tamias merriami - darker coastal variant
Click to enlarge. (68 kb)

Conservation Status: Least Concern.

Merriam's chipmunk's calls are distinctive. Perched on top of a stump or rock, the chipmunks vocalize long and vigorously, and the "chip" sound is often followed by a burst of sound called a "terminal pulse." These chipmunks are usually found below the timberline, at elevations of about 2,300-2,500 m. They nest in holes in the ground, under rocks, or in logs, and occasionally in holes in trees. When they are scampering in trees they jump from branch to branch, using their fluffy tails for balance. Where their range and the range of the California chipmunk overlap, the two may interbreed.

Sexual Dimorphism:

Average: 247 mm
Range: 240-255 mm

Average: 75 g
Range: 70-80 g


Allen, J.A., 1889.  Notes on a collection of mammals from southern Mexico, with descriptions of new species of the genera Sciurus, Tamias, and Sigmodon, p 176.  Bulletin of the American Museum of Natural History, 2:165-181.


Mammal Species of the World (opens in a new window).

Mammalian Species, American Society of Mammalogists' species account *
* PDF reader available here (opens in a new window).

Distribution of Tamias merriami

Image of Tamias merriami
Tamias merriami - lighter inland variant
Click to enlarge. (63kb)