 DESCRIPTION:
L=10" (25cm) including tail. Overall tan to gray with a dark collar.
But unlike the Collared Lizard, the spiny
lizards have keeled, pointed, rough scales.  Two
species occur in the desert around Tucson, the Desert Spiny (S. magister)
and the Clark's Spiny (S. clarkii). The Clark's Spiny has dark
bands on its wrist whereas the Desert Spiny does not. Males of both species
have bright blue throats and bellies. During the breeding season, females
may have orangish or reddish heads.
NATURAL HISTORY: Carnivorous, feeding on arthropods. Diurnal. Lay eggs
(unlike their mountain-living relatives -- see To
Lay or Not to Lay Eggs). Frequently displays head-bobbing
and push-up behavior. Spiny lizards, and some other lizards, will
change their color to be darker during cool times (thus absorbing more
heat from the sun) and lighter during warm times (thus reflecting more
of the solar radiation). Also, spiny lizard species living in the cooler,
higher elevations are darker. |
