Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Aves Plinius, nom. inval. - birds see Class Aves Linnaeus, 1758
           Order Picae nom. inval. see Order Picae Linnaeus, 1758
             1 Genus Paradisaea nom. inval. see Genus Paradisaea Linnaeus, 1758
             2 Genus Coracias nom. inval. see Genus Coracias Linnaeus, 1758
             3 Genus Corvus nom. inval. see Genus Corvus Linnaeus, 1758
             4 Genus Cuculus nom. inval. see Genus Cuculus Linnaeus, 1758
             5 Genus Picus nom. inval. see Genus Picus Linnaeus, 1758
             6 Genus Certhia nom. inval. see Genus Certhia Linnaeus, 1758
             7 Genus Sitta nom. inval. see Genus Sitta Linnaeus, 1758
             8 Genus Upupa nom. inval. see Genus Upupa Linnaeus, 1758
             9 Genus Ispida nom. inval. see Genus Merops Linnaeus, 1758