Sauropsida: Class Aves 



545 



Fig. 420. North African ostrich, Slruihio camellia. (Courtesy, Knowlton and 

 Ridgway: "Birds of the World," New York, Henry Holt & Co., Inc.) 



Order 7. Colymbiformes: Loons, grebes; divers; usually good 

 fliers; webbed feet used as swimming paddles; widely distributed, but 

 loons in Northern Hemisphere only. (The loons, Gavia (Fig. 424), are 

 sometimes put in a separate Order Gaviiformes.) 



Order 8. Procellariiformes: Albatrosses, petrels (Fig. 425); 

 large oceanic birds; strong fliers; webbed feet. 



Order 9. Pelecaniformes: Pelicans (Fig. 426), cormorants, 

 frigate birds; aquatic, but good fliers (except a flightless cormorant); 

 fish eaters; widely distributed. 



Order 10. Ciconiiformes: Herons (Fig. 427), egrets, storks, 

 ibises, flamingos; waders; long legs keeping the body above the 

 water, accompanied usually by long neck and long bill enabling the 

 bird to feed from the water or bottom. 



