Discover The 10 Largest Vipers in the World

They’re characterized by long, hinged fangs that can fold in and out like switchblade knives. All vipers are venomous, and all share characteristic vertically elliptical pupils, like a cat’s eye.

10. Common European Adder (Vipera berus)

They may not be the largest vipers in the world, but at three feet long, European adders are no tiny snakes.

9. Cottonmouth (Agkistrodon piscivorus)

They’re one of the largest vipers in the world, with adults growing up to four feet long.

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