ROUND-TAILED HORNED LIZARD

DESCRIPTION: An exceptionally flat and wide lizard with four widely separated, short, spike-like scales projecting from the back of the head. There are a few sporadic, pointed, projecting scales on the back. The tail is thin (for a horned lizard) and round in cross-section. This lizard's lack of a distinct fringe of enlarged, pointed scales on the lower edge of the body distinguishes it. Base coloration is and can change to more closely match the soil and to aid thermoregulation. There are dark bands on the tail and dark, soft-edged, shadow-like blotches on the neck and lower sides of the body. The underside is plain white.

BEHAVIOR: This primarily diurnal ground-dweller is most active in the mid-morning and on overcast days. It is also occasionally active at night. It hibernates during the cold months of winter and late fall. When threatened it often hunches its back, lowers its head, and remains motionless. This posture, coupled with the shadow-like markings on its lower sides, make the lizard resemble a small rock. When captured it may inflate itself by gulping air and poke with the horns.

DIET: The Round-tailed Horned Lizard feeds primarily on ants but it also takes termites, beetles, butterfly and moth larvae, snotlings, and other insects.