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any of nine species of lizards belonging to the lizard subfamily Crotaphytinae (family Crotaphytidae) found in hilly areas of the central United States and northeastern Mexico westward to the Great Basin. The coloration and pattern of collared lizards varies depending on species; however, coloration also varies with the season, temperature, and light intensity. Seasonal colour changes result from hormonal changes associated with reproduction. Males are typically much more brightly coloured than females and range from cobalt blue and green to tan, brown, and gray. Collared lizards frequently bring their front legs off the ground to run on their hind legs.