Mountain Beaver

January 2009
World Book Science Dataset;1/1/2009, p1
Reference Entry
Mountain Beaver (also called Sewellel, and Boomer), a chunky, burrowing rodent of the North American Pacific uplands. It is not a beaver, but is distantly related to the squirrels. The mountain beaver is probably the most primitive living rodent, first appearing some 10,000,000 years ago. It is about 12 inches (30 cm) long and has rough, dark-gray fur; small eyes and ears; short legs; and a very short tail. Its home is a complex system of tunnels dug in a damp forest. The animal feeds on vegetation, chiefly at night. It breeds in early spring, two to five furry young being born about seven weeks later.


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