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 Picae Linnaeus, 1758 see Parvclass Picae (C. Linnaeus, 1758)
             44 Genus Psittacus Linnaeus, 1758
             45 Genus Ramphastos Linnaeus, 1758
             46 Genus Buceros Linnaeus, 1758
             47 Genus Crotophaga Linnaeus, 1758
             48 Genus Corvus Linnaeus, 1758
             49 Genus Coracias Linnaeus, 1758
             50 Genus Gracula Linnaeus, 1758
             51 Genus Paradisaea Linnaeus, 1758
             51.0 Genus "Paradisea" Linnaeus, 1758 see Genus Paradisaea Linnaeus, 1758
             52 Genus Cuculus Linnaeus, 1758
             53 Genus Jynx Linnaeus, 1758
             54 Genus Picus Linnaeus, 1758
             55 Genus Sitta Linnaeus, 1758
             56 Genus Alcedo Linnaeus, 1758 - little kingfisher
             57 Genus Merops Linnaeus, 1758
             58 Genus Upupa Linnaeus, 1758
             59 Genus Certhia Linnaeus, 1758
             60 Genus Trochilus Linnaeus, 1758