Smithsonian National Museum of Natural History, North American Mammals
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Zapus princeps

Western Jumping Mouse

Order: Rodentia
Family: Dipodidae

Image of Zapus princeps
Zapus princeps - hibernating
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Conservation Status: Least Concern.

Western Jumping Mice are common in meadows, streamsides, and marshes in northwestern mountains. They also occur in subalpine meadows, and are found at low densities in dry, low-elevation, grassy habitats. The Mice have one litter per year. The young nurse for about a month, and after weaning have a month and a half to eat seeds and put on the fat they need to hibernate. Their summer weight is 18-24 g; just before hibernation, they can weigh up to 35 g. Only about half the juveniles who enter hibernation survive the winter.

Sexual Dimorphism:

Average: 231 mm
Range: 216-247 mm

Range: 18-24 g


Allen 1893.  Bulletin of the American Museum of Natural History, 5:71.


Mammal Species of the World

Distribution of Zapus princeps

Image of Zapus princeps
Click to enlarge. (79kb)