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)
             Genus Certhia Linnaeus, 1758
               1 Certhia familiaris Linnaeus, 1758
               2 Certhia pusilla Linnaeus, 1758
               3 Certhia caerulea Linnaeus, 1758 see Cyanerpes caeruleus (C. Linnaeus, 1758)
               4 Certhia cruentata Linnaeus, 1758 see Dicaeum cruentatum (C. Linnaeus, 1758)
               5 Certhia flaveola Linnaeus, 1758 see Coereba flaveola (C. Linnaeus, 1758)