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
Granite night lizard Granite night lizard The granite night lizard ("Xantusia henshawi" ) is a species of xantusiid lizard endemic to North America. The specific name, "henshawi", is in honor of American naturalist Henry Wetherbee Henshaw. "X. henshawi" is found in Mexico in the Mexican state of Baja California, and also in the United States in adjacent southern California. "X. henshawi" is flat-bodied with a broad, flat head and a soft skin. It has rounded, dark dorsal spots on a pale yellow or cream background. Its scales are granular on its dorsum, but large and squarish on the ventral surface. These lizards have