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The largest concentration of them is found in the southwestern United States and in northern Mexico. Arizona is home to 13 species of rattlesnakes, more than any other state. The most distinctive feature that these speᴄlias share is the rattle.
Residents of the southwestern United States have likely heard the distinctive buzz of these vipers. Its namesake rattle is a highly effective warning signal, telling predators to stay away.
“Rattles are segments of keratin that fit loosely inside one another at the end of the snake’s tail,” explained Sara Viernum, a Madison, Wisconsin-based herpetologist.
