Found 2 items, similar to mountain beaver.
English → English (WordNet) Definition: mountain beaver mountain beaver n : bulky nocturnal burrowing rodent of uplands of the Pacific coast of North America; the most primitive living rodent [syn: sewellel, Aplodontia rufa]
English → English (gcide) Definition: mountain beaver Sewellel \Se*wel"lel\, n. [Of American Indian origin.] (Zo["o]l.) A peculiar gregarious burrowing rodent (Haplodon rufus), native of the coast region of the Northwestern United States. It somewhat resembles a muskrat or marmot, but has only a rudimentary tail. Its head is broad, its eyes are small and its fur is brownish above, gray beneath. It constitutes the family Haplodontid[ae]. Called also boomer, showt'l, and mountain beaver. [1913 Webster]