| 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
Head and Body: 125-200 mm; Tail: 75-138 mm
Allen, J.A, 1897. Bulletin of the American Museum of Natural History, 9:54.
Mammal Species of the World (opens in a new window).
Mammalian Species, American Society of Mammalogists' species account (opens in a new window).