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 Grallae Linnaeus, 1758
             Genus Ardea Linnaeus, 1758
               01 Ardea pavonina Linnaeus, 1758 see Balearica pavonina (Linnaeus, 1758)
               02 Ardea virgo Linnaeus, 1758 see Anthropoides virgo (Linnaeus, 1758)
               03 Ardea canadensis Linnaeus, 1758 see Grus canadensis (Linnaeus, 1758)
               04 Ardea grus Linnaeus, 1758 see Grus grus (Linnaeus, 1758)
               05 Ardea americana Linnaeus, 1758 see Grus americana (Linnaeus, 1758)
               06 Ardea antigone Linnaeus, 1758 see Grus antigone (Linnaeus, 1758)
               07 Ardea ciconia Linnaeus, 1758 see Ciconia ciconia (Linnaeus, 1758)
               08 Ardea nigra Linnaeus, 1758 see Ciconia nigra (Linnaeus, 1758)
               09 Ardea nycticorax Linnaeus, 1758 see Nycticorax nycticorax (Linnaeus, 1758)
               10 Ardea cinerea Linnaeus, 1758 - grey heron
               11 Ardea herodias Linnaeus, 1758 - great blue heron
               12 Ardea violacea Linnaeus, 1758 see Nyctanassa violacea (Linnaeus, 1758)
               13 Ardea caerulea Linnaeus, 1758 see Egretta caerulea (Linnaeus, 1758)
               14 Ardea striata Linnaeus, 1758 see Butorides striata (Linnaeus, 1758)
               15 Ardea virescens Linnaeus, 1758 see Butorides virescens (Linnaeus, 1758)
               16 Ardea stellaris Linnaeus, 1758 see Botaurus stellaris (Linnaeus, 1758)
               17 Ardea alba Linnaeus, 1758 - great egret
               18 Ardea ibis Linnaeus, 1758 see Bubulcus ibis (Linnaeus, 1758)
               19 Ardea aequinoctialis Linnaeus, 1758