Rattlesnakes are vipers who have evolved to have rattling appendages on their tail, used to lure in prey or act as an auditory defense mechanism. They tend to live in deserts, and can be found in multiple continents. There are 33 species of rattlesnake, all found in North and South America from southern Canada to central Argentina. Ranging in size from 15 inches with the Pygmy Rattlesnake, to the largest at 8 feet long with the Eastern Diamondback Rattlesnake. They have hinged fangs that fold against the roof of the mouth and armed with hemotoxic venom, but the Mojave Rattlesnake has neurotoxic venom in some places of the Southwest region of the United States, making it the most venomous rattlesnake. All rattlesnakes have a rattle, but the Santa Catalina Rattlesnake or the Rattleless Rattlesnake is the only species of rattlesnake that doesn't have one. Due to living on an isolated island with no large animals. The rattle is made of keratin, and the snake adds a new section to it each time it sheds it's skin.
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