The
mountain beaver (
Aplodontia rufa) is a
North American rodent. It has several common names, including:
aplodontia,
boomer,
ground bear, and
giant mole. The name
sewellel beaver comes from
sewellel or
suwellel, the
Chinookan term for a cloak made from its pelts. This species is the only living member of its genus,
Aplodontia, and family,
Aplodontiidae. It should not be confused with true
North American and
Eurasian beavers, to which it is not closely related.