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Sigmodon planifrons

Miahuatlán Cotton Rat

Order: Rodentia
Family: Cricetidae


Conservation Status: Endangered. This species has a small range, is fragmented into several groups and is losing of habitat.

This cotton rat might, in fact, be a subspecies of Sigmodon alleni (Allen’s Cotton Rat), which also occurs in Oaxaca. Scientists are increasingly able to use DNA to tease out evolutionary relationships and figure out modern relationships among and within species. Cotton rats can be agricultural pests, especially where sugar cane and sweet potatoes are grown. The rats reproduce rapidly, can become very numerous, and will eat everything from crops to ground-nesting birds and their eggs to crayfish they find in ditches.

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

Range: 70-211 g


Nelson & Goldman, 1933. Proceedings of the Biological Society of Washington, 46:197.


Mammal Species of the World

Distribution of Sigmodon planifrons