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An order of the Mammalia (see mammal) that includes the beavers, squirrels, porcupines, guinea pigs, rats, and mice. It is the largest order of mammals, and includes almost 1,500 living species. All rodents have a single pair of incisor teeth that grow throughout life and wear to form sharp chisel edges used for gnawing. They are predominantly eaters of seeds and tough vegetable matter. Some species are important pests.

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