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Aplodontidae (mountain beaver; order Rodentia, suborder Sciuromorpha) A family of burrowing rodents in which the body is thickset and heavy, the limbs and tail short, and the claws large. The eyes and ears are small. The skull is flat, wide posteriorly, and the palate broad. The animal is found only in the N. American Rockies. There is one genus (Aplodontia), and one species.