Gila Monster

a poisonous lizard also called Sonoran heloderm. It is one of the largest lizards of North America, and is found in the sandy deserts of New Mexico, Arizona, and Texas. Its scales are brilliant orange and jet black. It has grooved teeth and highly developed salivary glands at their bases. Its bite-is rapidly fatal to small mammals and birds, and very injurious, though seldom fat a], to man. The heloderms are the only lizards ascertained to be venomous.