Also known as a cottonmouth, the water moccasin is a relative of the copperhead and is the world's only semi-aquatic viper. Found near marshes or lakes, moccasins are strong swimmers but slow movers. Cottonmouth venom is cytotoxic, meaning it destroys tissue and can lead to limb amputation. Located in the southeastern U.S., these cousins average about 31 inches from head to tail and weigh a little over a pound.

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