Gila monster Gila monster The Gila monster ("Heloderma suspectum", ) is a species of venomous lizard native to the southwestern United States and northwestern Mexican state of Sonora. A heavy, typically slow-moving lizard, up to long, the Gila monster is the only venomous lizard native to the United States and one of only two known species of venomous lizards in North America, the other being its close relative, the Mexican beaded lizard ("H. horridum"). Although the Gila monster is venomous, its sluggish nature means it represents little threat to humans. However, it has acquired a fearsome reputation, and is sometimes killed despite
Banded rock lizard Banded rock lizard The banded rock lizard ("Petrosaurus mearnsi" ) is a species of lizard in the family Phrynosomatidae. The species is native to western North America. The specific name, "mearnsi", is in honor of American naturalist Edgar Alexander Mearns, who collected the first specimens. "P. mearnsi" is endemic to extreme southern California and Baja California, Mexico. It also occurs on Isla El Muerto. "P. mearnsi" is an extremely flat-bodied lizard. Its dorsum is olive, brown or gray, with white or bluish spots. It has a single black collar, a banded tail, and granular scales on its body, with keeled