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Rodents are mammals that continually chew food using incisors in the upper and lower jaws.
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Forty percents of mammal species are rodents.
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They are found in all Continents except Antarctica.
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The common rodents are mice, rats, squirrels, Beavers Gerbils, Capybaras, Prairie dogs Porcupine, Chipmunk, Guinea pigs and voles.
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Rodents make up the largest order of mammals.
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The ancestors of rodents are from 65 million years ago.
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They have suppose to suppose to appear during Cretaceous period.
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There are 2,010 species of Rodents