Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Procellariiformes Fürbringer, 1888
                   1 Family Diomedeidae Gray, 1840 - albatrosses
                   2 Family Procellariidae Leach, 1820 - petrels, shearwaters
                   3 Family Hydrobatidae Mathews, 1912 - storm petrels see Family Oceanitidae Forbes, 1882
                   4 Family Pelecanoididae Gray, 1871 - diving petrels