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
           1 Order Accipitres Linnaeus, 1758 see Suborder Accipitres (C. Linnaeus, 1758)
           2 Order Picae Linnaeus, 1758 see Parvclass Picae (C. Linnaeus, 1758)
           3 Order Anseres Linnaeus, 1758 see Suborder Anseres Linnaeus, 1758
           4 Order Grallae Linnaeus, 1758
           5 Order Gallinae Linnaeus, 1758
           6 Order Passeres Linnaeus, 1758 see Suborder Passeres (C. Linnaeus, 1758) C. Linnaeus, 1766