A peculiar gregarious burrowing rodent (Haplodon rufus),
   native of the coast region of the Northwestern United States. It
   somewhat resembles a muskrat or marmot, but has only a rudimentary
   tail. Its head is broad, its eyes are small and its fur is brownish
   above, gray beneath. It constitutes the family Haplodontidae. Called
   also boomer, showt'l, and mountain beaver.