Subadult active at roadside park, gravel and leaf litter of Musquiz Cienega valley floor. Animal to the upper right of the bright blue beer bottle cap (upper right center of photo), best viewed in "original" enlarged format and perhaps not diagnostic.
Juvenile active on sidewalk/gravelly area along San Felipe del Rio Creek
Note the molt in the tail and mud on the head.
Teiidae is a family of lizards native to the Americas, generally known as whiptails. The group includes the parthenogenic genera Cnemidophorus and Aspidoscelis, and the non-parthenogenic Tupinambis. It has over 230 member species in ten genera. About 75% of the species are in two dominant genera, Aspidoscelis and Cnemidophorus.