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 Larus Linnaeus, 1758
               1 Larus tridactylus Linnaeus, 1758 see Rissa tridactyla (Linnaeus, 1758)
               2 Larus canus Linnaeus, 1758 - mew gull
               3 Larus marinus Linnaeus, 1758 - great black-backed gull
               4 Larus fuscus Linnaeus, 1758 - lesser black-backed gull
               5 Larus atricilla Linnaeus, 1758 - laughing gull
               6 Larus parasiticus Linnaeus, 1758 see Stercorarius parasiticus (Linnaeus, 1758)