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Different types of rattlesnakes can be found in many different parts of the United States. Most, however, are found in the American Southwest. Because there are many types of rattlesnakes, they don't all look the same. The average adult size is three to four feet in length, though some may be smaller and others longer. In general, however, their coloring is earth-toned and they often have diagonal patterns on their scales. The easiest way to identify a rattlesnake is by the distinctive rattle at the end of their tail. Rattlesnakes, shake their tail to sound their rattle. This is a signal to stay away.