Rattlesnakes are the most widely known of the pit vipers (family Viperidae). They are found throughout the United States and parts of Canada and account for most poisonous (venomous) snakebites in North America. They leave one, two, or three puncture marks on the skin, but you won't always see any marks.
Rattlesnakes can be up to 8 ft (2.5 m) long and have:
Symptoms of a rattlesnake bite usually appear from minutes to hours after a bite and can include:
If you think you have been bitten by a rattlesnake, call
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