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
Slender glass lizard is regarded as vulnerable or endangered in some states. Its primary threats are loss of habitat, and the fragmentation of what remains, by human development. Slender glass lizard The slender glass lizard ("Ophisaurus attenuatus") is a legless lizard in the family Anguidae. The species is endemic to the United States. Two subspecies are recognised. Slender glass lizards have yellow to brown bodies with six stripes, and they have two lateral grooves (one on each side). Unlike snakes, they have eyelids and ears. "O. attenuatus" can attain a total length (including tail) of up to 1 meter (about 40 inches). "O.