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10 creatures that deliver the most painful stings and bites

Viper

Photo: Webbaliah/Flickr

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Viper

There are more deadly snake bites than those delivered by a viper, but viper bites are reputed to be the most painful. Van Wallach of the Harvard Museum of Comparative Zoology describes his worst encounter with a viper as follows: "It felt like somebody had a blowtorch and was burning the inside your arm. It went on for three straight days before I had any relief." Of course, envenomation from a viper can also kill you, so it's best to avoid these slithery serpents at all costs.