Rattlesnake facts consist of a lot more interesting information aside from just how intimidating they are. In fact, they are one of the most well-known and feared snakes on the planet. Although there are 30 types of rattlesnakes found in the world, there are only four varieties in the United States to worry about being the copperhead, the coral snake, the rattlesnake and the cottonmouth water moccasin. Below are 25 more rattlesnake facts that you might enjoy.