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Organism
  Animalia
      Chordata
            Aves
                    Bucerotiformes
                            Bucerotidae
                                     Bycanistes
                                             Bycanistes albotibialis
                                             Bycanistes cylindricus
                                             Bycanistes fistulator
                                               Bycanistes fistulator fistulator
                                               Bycanistes fistulator sharpii
                                             Bycanistes subcylindricus
                                     Ceratogymna
                                             Ceratogymna atrata
                                     Horizocerus
                                             Horizocerus albocristatus
                                               Horizocerus albocristatus cassini
                                             Horizocerus hartlaubi
                                               Horizocerus hartlaubi hartlaubi
                                     Lophoceros
                                             Lophoceros camurus
                                             Lophoceros fasciatus
                                                   [Tockus fasciatus]
                                               Lophoceros fasciatus fasciatus
                                                     [Tockus fasciatus fasciatus]
                                     Tockus