Sauromalus Obesus is the scientific name of the chuckwalla, a lizard species native to North America. There are several synonyms used to refer to this species, including Sauromalus ater, Sauromalus varius, and Sauromalus hispidus. The chuckwalla is notable for its large, round body and its ability to inflate itself to avoid predation. It is also known for its ability to survive in extreme temperatures and dry environments. While the chuckwalla may have various names, it remains an iconic species of the American Southwest and an important part of the region's ecosystem.