#tree_squirrel  any typical arboreal squirrel
  supertype:  #squirrel  a kind of arboreal rodent having a long bushy tail
  member of:  #genus_Sciurus
  subtype:  #eastern_gray_squirrel__cat_squirrel__catsquirrel__Sciurus_carolinensis  common medium-large squirrel of eastern North America; now introduced into England
  subtype:  #western_gray_squirrel__Sciurus_griseus  large gray squirrel of far western areas of United States
  subtype:  #eastern_fox_squirrel__easternfoxsquirrel__fox_squirrel__foxsquirrel__Sciurus_niger  exceptionally large arboreal squirrel of eastern United States
  subtype:  #black_squirrel__blacksquirrel  fox squirrel or gray squirrel in the black color phase
  subtype:  #red_squirrel__redsquirrel__cat_squirrel__catsquirrel__Sciurus_vulgaris  common reddish-brown squirrel of Europe and parts of Asia
  subtype:  #American_red_squirrel__spruce_squirrel__red_squirrel__redsquirrel__Sciurus_hudsonicus__Tamiasciurus_hudsonicus  of northern United States and Canada
  subtype:  #chickeree__Douglas_squirrel__Tamiasciurus_douglasi  far western United States counterpart of the red squirrel

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