Gila Monster

Gila Monster: This heavy, slow-moving lizard has one of the worst reputations in the reptile world. It is often feared and has been described as frightful and repulsive, especially in local folklore. It has been accused of many things, such as spitting venom, leaping several feet in the air to attack, stinging with its tongue, and killing people with gusts of poisonous breath.

Yep...that sounds just about right...