Smithsonian National Museum of Natural History, North American Mammals
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Perognathus inornatus

San Joaquin Pocket Mouse

Order: Rodentia
Family: Heteromyidae

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Conservation Status: Least Concern.

The San Joaquin Pocket Mouse vocalizes with low grunts, growls, and squeals, and communicates aggression by tooth-chattering. This species will consume earthworms and soft-bodied insects, but its diet is mainly very tiny seeds of grasses, forbs, and shrubs. Its burrows are conspicuous in the short grass where it lives, in west-central California. To groom their fur, San Joaquin Pocket Mice sandbathe, digging into the loose sandy soil and then sliding and rubbing their bodies in the sand.

Sexual Dimorphism:
Males are slightly larger than females.

Average: 149 mm males; 147 mm females

Range: 7-12 g


Merriam, C.H., 1889.  Preliminary revision of the North American pocket mice (genera Perognathus et Cricetodipus auct.) with descriptions of new species and subspecies and a key to the known forms, p. 15.  North American Fauna, 1:1-36.


Mammal Species of the World

Mammalian Species, American Society of Mammalogists' species account

Distribution of Perognathus inornatus

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