Smithsonian National Museum of Natural History, North American Mammals
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  Rodentia · Cricetidae · Sigmodon arizonae
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Sigmodon arizonae

Arizona Cotton Rat

Order: Rodentia
Family: Cricetidae

Image of Sigmodon arizonae
Sigmodon arizonae - right (with S. fulviventer)
Click to enlarge. (95 kb)

Conservation Status: Least Concern.

All cotton rats have a strong connection with grass, which they feed upon, and in which they construct their runways. Within their range in southeast and central Arizona and western Mexico, Arizona cotton rats inhabit only grassy areas where there is enough water to support grasses, weeds, or brush. They are common around ponds and in irrigated fields. They give birth to fully-furred young who can run around within a few hours after they are born. Population booms sometimes occur shortly after periods of rain.

Range: 200-349 mm

Average: 172 g
Range: 125-211 g


Mearns, E.A., 1890.  Bulletin of the American Museum of Natural History, 2:287.


Mammal Species of the World

Distribution of Sigmodon arizonae