Genus Crotaphytus is a group of lizards that belong to the iguana family. These lizards are commonly referred to as collared lizards and are native to arid regions in North America. The word Crotaphytus comes from the Greek words krotos, meaning "rattle," and phyton, meaning "plant" or "animal." There are several synonyms for the genus Crotaphytus, including the following: Gambelia, Holbrookia, and Uma. The collared lizards are known for their prominent collars, which are found around their necks and can be raised or lowered depending on their mood. These lizards are also known for their vibrant colors, which range from yellow to orange and red.