Smithsonian National Museum of Natural History, North American Mammals
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Sigmodon mascotensis

West Mexican Cotton Rat

Order: Rodentia
Family: Cricetidae


Conservation Status: Least Concern.

Cotton rats were given the generic name "Sigmodon" because they have an S-shaped pattern on the cusps of their cheek teeth. "Sigma" is Greek for the letter "S," and "don" refers to tooth. These West Mexican Cotton Rats are medium-sized rats. They are omnivorous, eating plant matter, insects, and other small mammals and are active year-round.

Also known as:
Jaliscan Cotton Rat

Range: Head and Body: 125-200 mm; Tail: 75-138 mm

Range: 70-211 g


Allen, J.A, 1897. Bulletin of the American Museum of Natural History, 9:54.


Mammal Species of the World

Distribution of Sigmodon mascotensis