It is the only venomous lizard native ... at University of Arizona. Their venom usually causes aches and swelling, but it can result in a necrotic ulcer. The female black widow spider is ...

The desert-dwelling Gila monster (Heloderma suspectum) is the United States' largest and only native venomous lizard. Easily recognisable from its spotted orange-and-black skin, its bright armour ...