Maximum size of five inches from snout to tip of the tail; males have longer tails and may grow slightly larger than females.
Gray or light brown with darker brown stripes on the back set inside lighter stripes on the sides, running the length of the body; stripes not always prominent and may appear as a pattern of checks down the back; underside usually cream or white.
Males have bright blue patches on the belly and on each side, with blue mottling on the throat.
Usually found below 6,000 feet but in Yellowstone lives up to 8,300 feet.
Populations living in thermally influenced areas are possibly isolated from others.
Most common along the lower portions of the Yellowstone River near Gardiner, Montana, and upstream to the mouth of Bear Creek; also occurs in Norris, Shoshone, and Heart Lake geyser basins, and other hydrothermal areas.
Come out of hibernation about mid-May and active through mid-September.
Diurnal, generally observed during warm, sunny weather in dry rocky habitats.
During the breeding season males do push-ups on elevated perches to display their bright blue side patches to warn off other males.
Feed on various insects and arthropods.
Eaten by bullsnakes, terrestrial garter snakes, prairie rattlesnakes, and some birds.