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 Gallinae Linnaeus, 1758
             Genus Crax Linnaeus, 1758
               1 Crax nigra Linnaeus, 1758 see Crax alector Linnaeus, 1766
               2 Crax rubra Linnaeus, 1758 - great curassow