Smithsonian National Museum of Natural History, North American Mammals
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Tamias quadrimaculatus

Long-eared Chipmunk

Order: Rodentia
Family: Sciuridae

Image of Tamias quadrimaculatus
Tamias quadrimaculatus - winter coloration (upper) and summer coat (lower)
Click to enlarge. (69 kb)

Conservation Status: Least Concern.

Long-eared chipmunks are striking, with sharp, bright markings and the longest ears of any chipmunk. They live at middle elevations (970-2,290 m) in the Sierra Nevada Mountains. They sometimes nest in trees in summer, but more often den in secluded places on or near the ground. In November, they begin a four-month hibernation, first by adding about 20 percent to their body weight. They eat the same wide variety of foods as most chipmunks, including seeds, fungi, flowers, berries, the pupae of butterflies, and other insects.

Also known as:
Sacramento Chipmunk, Four-banded Chipmunk

Sexual Dimorphism:
Females are slightly larger than males.

Average: 233 mm males; 239 mm females
Range: 230-239 mm males; 230-245 mm females

Average: 78.1 g males; 91.9 g females
Range: 74.1-89 g males; 81-107 g females


Gray, J.E., 1867.  Synopsis of the species of burrowing squirrels (Tamias) in the British Museum, p. 435.  Annals and Magazine of Natural History, series 3, 20:434-436.


Mammal Species of the World

Mammalian Species, American Society of Mammalogists' species account

Distribution of Tamias quadrimaculatus