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10 creatures that deliver the most painful stings and bites

Black widow spider

Photo: Wikimedia Commons

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Black widow

One of the world's most notorious spiders, the black widow lives up to its reputation and is capable of delivering a bite that ranks among the most painful in nature. Interestingly, bites from small black widows are benign because the smaller spiders aren't capable of delivering much venom. But if you're unlucky enough to get bitten by a larger widow, get ready for a rough ride. Envenomation from a black widow can cause a condition called latrodectism, which involves constant, strong, painful muscle contractions that seem never-ending.