Imperium naturæ C. Linnaeus, 1758 - nature
Status: extant
   Mundus Plinius - physical world
  Status: extant
     naturalia - natural bodies
    Status: extant
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
      Status: extant
         Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
        Status: extant
           Order Anseres Linnaeus, 1758 see Suborder Anseres Linnaeus, 1758
          Status: extant
             Genus Alca Linnaeus, 1758
            Status: extant
               Alca arctica Linnaeus, 1758 see Fratercula arctica (Linnaeus, 1758)
              Status: extant