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Our deadliest native scorpion??? The Arizona bark scorpion is widely considered to be the most dangerous scorpion in the United States. Their stings are excruciatingly painful and potent, and in rare cases could lead to complications that could require emergency medical attention. Found in the American southwest, these scorpions are primarily nocturnal and spend their active hours probing around for food. No small invertebrate is safe from the vice-like grip of their pincers and the toxic sting