From Baja California, there are no records. The Gila monster lizard may be found in Sonora, Arizona, sections of California, Nevada, Utah, and New Mexico, as well as other portions of the United States and Mexico. Despite being protected by state law in Arizona, its exaggeratedly terrifying reputation has resulted in it being murdered on occasion. The Gila monster is poisonous, but because of its slow nature, it is not typically harmful and poses only a minor threat to people. The four 'Mexican beaded lizards' (previous subspecies of Heloderma horridum) are near poisonous cousins that live in Mexico and Guatemala. It is a large, slow-moving lizard that may grow up to 60 cm long. The Gila monster lizard is the only poisonous lizard endemic to the United States. The Gila monster (Heloderma lizard) is a poisonous lizard that is native to the southwestern United States and the state of Sonora in northern Mexico. Many teeth contain two grooves that carry venom, a nerve toxin, from lower jaw glands. Their muscular jaws and big heads produce a powerful bite that is held in place as venom penetrates into the victim. Heloderma species are slow, deliberate predators. During the winter months, fat stored in the tail and belly is consumed.

During the summer, the Gila monster feeds on small animals, birds, and eggs at night. horridum) is a closely related species that is somewhat bigger (up to 80 cm ) and darker in colour. It has a sturdy body with black and pink spots or bands. It has beadlike scales and grows to around 50 cm (20 inches). The Gila monster (Heloderma lizard) is found in the southwestern United States and northern Mexico and was named after the Gila River basin. The Gila monster lizard (Heloderma suspectum) is one of two poisonous lizard species found in North America, belonging to the genus Heloderma and the family Helodermatidae.

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