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mountain beaver

noun
1.
a small, burrowing rodent, Aplodontia rufa, of the Pacific coastal region of North America, considered the most primitive living rodent.
Also called sewellel.
Origin
1880-1885
1880-85, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for mountain beaver

a muskrat-sized burrowing rodent found only in the Pacific Northwest of North America. Unlike the American and Eurasian beavers (genus Castor), the mountain beaver has an extremely short tail and is less than a half metre (1.6 feet) in length; weight is less than 2 kg (4.4 pounds)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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