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 Anseres Linnaeus, 1758 see Suborder Anseres Linnaeus, 1758
             Genus Mergus Linnaeus, 1758
               1 Mergus cucullatus Linnaeus, 1758 see Lophodytes cucullatus (Linnaeus, 1758)
               2 Mergus merganser Linnaeus, 1758 - goosander
               3 Mergus serrator Linnaeus, 1758 - red-breasted merganser
               4 Mergus albellus Linnaeus, 1758 see Mergellus albellus (Linnaeus, 1758)
               5 Mergus minutus Linnaeus, 1758