Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["Animale Regnum" 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
               [Genus "Certhia" nom. inval.] see Genus Certhia Linnaeus, 1758
                 1 "Certhia" nom. inval.