#family_Castoridae__Castoridae  beavers
  supertype:  mammal_family  a family of mammals
  member of:  suborder_Sciuromorpha
  member:  genus_Castor__Castor  type genus of the Castoridae: beavers
     member:  beaver  large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges
  member:  genus_Castoroides__Castoroides  extinct beavers of the Pleistocene; of eastern and southern United States

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