Imperium naturæ C. Linnaeus, 1758 - nature
Status: extant
   Mundus Plinius - physical world
  Status: extant
     naturalia - natural bodies
    Status: extant
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
      Status: extant
         Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
        Status: extant
           Order Picae Linnaeus, 1758 see Parvclass Picae (C. Linnaeus, 1758)
          Status: extant
             Genus Buceros Linnaeus, 1758
            Status: extant
               1 Buceros bicornis Linnaeus, 1758 - great hornbill
              Status: extant
               2 Buceros rhinoceros Linnaeus, 1758 - rhinoceros hornbill
              Status: extant