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 Passeres nom. inval. see Order Passeres Linnaeus, 1758
             Genus Luscinia nom. inval. see Genus Motacilla Linnaeus, 1758
               1 Luscinia nom. inval.
               2 Ficedula nom. inval.
               3 Erithacus Plinius, nom. inval.
               4 Troglodytes nom. inval.
               5 Carolina Rudb., nom. inval.