#racer  slender fast-moving North American snakes
  supertype:  #colubrid_snake__colubrid  mostly harmless temperate-to-tropical terrestrial or arboreal or aquatic snakes
  member of:  #genus_Coluber
  subtype:  #blacksnake__black_racer__Coluber_constrictor  blackish racer of the eastern United States that grows to six feet
     subtype:  #blue_racer__Coluber_constrictor_flaviventris  bluish-green blacksnake found from Ohio to Texas
  subtype:  #horseshoe_whipsnake__Coluber_hippocrepis  slender fast-moving Eurasian snake

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