Western United States, Canada, and Mexico from southern Alberta and southern Saskatchewan southward to New Mexico, Arizona, mountains of western Texas, and southern Durango, Mexico.
Generally found in open areas which can range from wooded terrain to semiarid plains. Inhabits both rocky and sandy soil; burrows in rodent burrows.
Camouflage well into surroundings with either grayish, yellowish, reddish, or brownish dorsum. Displays numerous horns on head and pointed scales across back. Body is flat and legs are short. Adult snout to vent length ranges from 2 to 5 inches (5.1 to 12.7 cm). Males and females mate in spring from May to June; females give live birth. Young do not have horns and are self-reliant a few hours after birth.
Learn more with Schechter Natural History's Guide to Reptiles and Amphibians