Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
           Order Anseres Linnaeus, 1758 see Suborder Anseres Linnaeus, 1758
             Genus Pelecanus Linnaeus, 1758
               1 Pelecanus onocrotalus Linnaeus, 1758 - great white pelican
               2 Pelecanus aquilus Linnaeus, 1758 see Fregata aquila (Linnaeus, 1758)
               3 Pelecanus carbo Linnaeus, 1758 see Phalacrocorax carbo (Linnaeus, 1758)
               4 Pelecanus bassanus Linnaeus, 1758 see Morus bassanus (Linnaeus, 1758)
               5 Pelecanus piscator Linnaeus, 1758