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 Alcedo Linnaeus, 1758 - little kingfisher
               1 Alcedo ispida Linnaeus, 1758
               2 Alcedo erithaca Linnaeus, 1758 see Ceyx erithaca (C. Linnaeus, 1758)
               3 Alcedo alcyon Linnaeus, 1758 see Megaceryle alcyon (C. Linnaeus, 1758)
               4 Alcedo todus Linnaeus, 1758 see Todus todus (C. Linnaeus, 1758)
               5 Alcedo smyrnensis Linnaeus, 1758 see Halcyon smyrnensis (C. Linnaeus, 1758)
               6 Alcedo rudis Linnaeus, 1758 see Ceryle rudis (C. Linnaeus, 1758)
               7 Alcedo dea Linnaeus, 1758 see Galbula dea (C. Linnaeus, 1758)