Genus Sauromalus refers to a group of lizards that are commonly known as spiny lizards or chuckwallas. These reptiles are native to the southwestern United States and Mexico, and are often found in rocky areas and deserts. Other synonyms for the Genus Sauromalus include the Desert Iguana and Desert Chuckwalla. They have a distinctive spiny appearance and are known for their ability to rapidly change color, typically depending on their mood and the temperature around them. Predominantly herbivorous, spiny lizards are capable of eating a variety of desert plants and can go extended periods without water. They are generally slow-moving, but can become aggressive if threatened.