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Organism
  Animalia
      Chordata
            Aves
              Avialae
                    Charadriiformes
                      Lari
                            Stercorariidae
                                     Stercorarius
                                             Stercorarius longicaudus
                                             Stercorarius maccormicki
                                             Stercorarius parasiticus
                                             Stercorarius pomarinus
                                             Stercorarius skua