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mountain beaver

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noun
  1. a small, burrowing rodent, Aplodontia rufa, of the Pacific coastal region of North America, considered the most primitive living rodent.

Origin of mountain beaver

An Americanism dating back to 1880–85
Also called sewellel.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018