Crotaphytus bicinctores , Photo: National Park Service
Crotaphytus collaris (Say, 1823)
Crotaphytus bicinctores is a species of lizard known as the Desert Collared Lizard or the Mohave Black Collared Lizard. It is very similar to the Common Collared Lizard, Crotaphytus collaris, in shape and size, but it lacks the bright extravagant colors. Males can be brown to orange and some red or pink on the belly. Females are more black or dark brown. C. bicintores have elongated scales near the nails and their tail is more triangular in shape than round as with C. collaris. Crotaphytus bicinctores utilizes external energy for their body heat.
Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License