The Loons (Gaviiformes) - 0rder
(Gaviella) -extinct-

(Gaviella )
-extinct-

()

()

()
(Neogaeornis) -extinct-

(Neogaeornis )
-extinct-

()

()

()
(Polarornis) -extinct-

(Polarornis )
-extinct-

()

()

()
(Colymboididae) - family -extinct-
() -extinct-

()
-extinct-

()

()

()
(Gavidae) - family
(Gavia)
Yellow-Billed Loon
(Gavia adamsii)
Arctic Loon
(Gavia arctica)
Pacific Loon
(Gavia pacifica)
Red-Throated Loon
(Gavia stellatas)
Common Loon
(Gavia immer)
Eastern Canadian Loon
(Gavia immer )
Great Lakes Loon
(Gavia immer )
Western Canadian Loon
(Gavia immer )