Smithsonian National Museum of Natural History, North American Mammals
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Thomomys mazama

Western Pocket Gopher

Order: Rodentia
Family: Geomyidae

Image of Thomomys mazama
Click to enlarge. (39 kb)

Conservation Status: Least Concern.

As is the case with a number of pocket gopher species, most aspects of the Western Pocket Gopher's life have not yet been studied. This Pocket Gopher lives in rich volcanic soils of alpine meadows and small glacial prairies, west of the Cascade Mountains in northern California, Oregon, and Washington. When Western Pocket Gophers are caught, they are always alone in their burrows.

Also known as:
Mazama Pocket Gopher

Sexual Dimorphism:
Males are larger than females.

Range: 191-233 mm

Range: 75-125 g


Merriam, C.H., 1897.  Proceedings of the Biological Society of Washington, 11:214.


Mammal Species of the World

Distribution of Thomomys mazama