Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Gaviiformes Wetmore & Miller, 1926
           Family Gaviidae Allen, 1897 - divers
             Genus Gavia Forster, 1788
               1 Gavia stellata (Pontoppidan, 1763) - red-throated diver
               2 Gavia arctica (Linnaeus, 1758) - black-throated diver
               3 Gavia pacifica (Lawrence, 1858) - Pacific loon
               4 Gavia immer (Brünnich, 1764) - common loon
               5 Gavia adamsii (Gray, 1859) - white-billed diver