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 Procellaria Linnaeus, 1758
               1 Procellaria pelagica Linnaeus, 1758 see Hydrobates pelagicus (Linnaeus, 1758)
               2 Procellaria aequinoctialis Linnaeus, 1758 - white-chinned petrel
               3 Procellaria capensis Linnaeus, 1758 see Daption capense (Linnaeus, 1758)