Although Heloderma horridum is a unique and specific species of venomous lizard in the world, it is often referred to by other names. The most commonly used synonyms for Heloderma horridum are Gila monster, Lanthanotus borneensis, the Sonoran monster, and the beaded lizard. The term Gila monster is commonly used as it is the only venomous lizard species found in the United States where it inhabits the Sonoran Desert. The term Lanthanotus borneensis refers to the a venomous lizard species found natively in Borneo. Although these species are both venomous, they are distinct from Heloderma horridum in terms of their physical characteristics and natural habitats.