The mountain beave is a unique rodent found only in the western portions of southern British Columbia, Washington, Oregon, and northern California. The mountain beaver is not a "true" beaver, but was so named by California miners due to its habitat of cutting limbs and gnawing bark, similar to that of the beaver. The mountain beaver, which also is known as "boomer" and "sewellel", is actually a very primitive mammal belonging to the oldest known family of living rodents. It is the sole living member of the family Aplodontidae. Mountain beavers are approximately 12 inches (30 centimeters) long and weigh about 2 pounds (900 grams). They are brown or black, have very short stubby tails, and are stocky in appearance. Although primarily nocturnal they will venture out during daylight hours.
Source: NPS.gov
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