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     But the rattlesnake, or ‘rattler’ as it is sometimes called, prefers to avoid people if it possibly can. It holds its tail upright and rattles the end whenever it is disturbed, in the hope that the intruder will go away. However, if its warnings are ignored—and it feels threatened—it will coil ready to bite. But the rattler itself cannot hear the noise its own tail makes. Like most snakes, it ‘hears’ things through vibrations in the ground. If a person walks nearby the snake can feel the movement. But if the same person were to shout, it would not hear a thing. Rattlesnakes are very common and widespread animals, living right across the American continent from Canada to Argentina. They feed on a variety of prey, including mice, voles, rats, chipmunks and many other small animals. Rattlesnakes kill their prey with venom. Like all snakes, they swallow the unfortunate animals whole. Few snakes have to eat more than once a week and some, such as the larger pythons, can survive for a year or more without eating.