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There are only two species of venomous lizard in the world and the Gila monster (Heloderma suspectum), named after the Gila River Basin of the southwestern United States, is one of them. The painful bite is rarely fatal to humans but can cause nausea, fainting, vomiting and excessive thirst. Unlike snake bites, the toxin is not injected but flows from glands down two grooves in the teeth and onto the wound as the lizard chews on its victim. Not surprisingly, the first piece of advice offered to anyone bitten is to flush the wound with copious amounts of fresh water - after removing the lizard of course.

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