mountain beaver


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mountain beaver,

stout, short-limbed North American rodentrodent,
member of the mammalian order Rodentia, characterized by front teeth adapted for gnawing and cheek teeth adapted for chewing. The Rodentia is by far the largest mammalian order; nearly half of all mammal species are rodents.
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, Aplodontia rufa, not closely related to the true beaver. Also called sewellel beaver after the Chinook word for a robe made from its pelts, it is among the most primitive of the rodents and the only living member of its family. The mountain beaver is about 12 in. (30.5 cm) long, grayish or brownish red in color, and nearly tailless. With small eyes and ears and a blunted muzzle, it resembles a tailless muskrat. Its enlarged claws make it an excellent burrower, and it is also a good swimmer and tree climber. Generally nocturnal, the mountain beaver is found along the Pacific coast from British Columbia to California. Inhabiting damp, wooded country near streams, the rodent eats bark, leaves, and twigs. It builds complex colonial burrows with chambers for food storage, sleeping, and nesting. The location of mountain beavers is in part explained by the fact that they cannot adequately regulate the temperature of their bodies and must therefore live in stable, cool, moist environments. Mountain beavers are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Mammalia, order Rodentia, family Aplodontidae.
References in periodicals archive ?
Early successional forest and riparian habitat also support persistent Mountain Beaver populations (Arjo and others 2007).
Several clusters were investigated in active Mountain Beaver colonies, but did not yield prey remains.
UNLIKELY SURVIVORS: Despite primitive kidneys and a low reproductive rate, the mountain beaver (above) has persisted longer-40 million years-than any other living rodent species.
Yet mountain beavers hang in there in some areas," adds Steele, now with the California Department of Fish and Game.
Goat hooves were also caving in the burrow systems of rare mountain beavers on the subalpine slopes.