Smithsonian National Museum of Natural History, North American Mammals
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Arborimus longicaudus

Red Tree Vole

Order: Rodentia
Family: Cricetidae

Image of Arborimus longicaudus
Arborimus longicaudus - northern, larger variant at top, southern, brighter colored variant at bottom
Click to enlarge. (85 kb)

Conservation Status: Near Threatened. Loss of habitat threatens this species.

The home range of a Red Tree Vole may consist of just one tree, usually a large old Douglas-fir, where the vole builds its nest, eats the needles, and gets water by licking dew drops from the needles. Nests have been found more than 50 m (150 feet) above the ground. Except for females with young, the Voles nest alone, although several may nest in the same tree, and Voles may re-use empty nests. They are tiny, weighing only an ounce or so and measuring about 4 inches from nose to rump. Their fur is thick, soft, and long, brownish-red in Voles from the Oregon coast, and lighter brown to orangish-red in the Cascades subspecies. The northern spotted owl is their main predator.

Also known as:
Reddish Tree Mouse

Sexual Dimorphism:
Females are larger than males.

Average: 172 mm males; 184 mm females
Range: 158-206 mm

Range: 25-47 g


True, F.W., 1890.  Proceedings of theU. S. National Museum, 13:303.


Mammal Species of the World

Mammalian Species, American Society of Mammalogists' species account

Distribution of Arborimus longicaudus

Image of Arborimus longicaudus
Click to enlarge. (179kb)