Sauropsida: Class Aves 



549 



Fig. 427. Great blue heron, Ardea herodias. (Courtesy, Knowlton and Ridgway: 

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



Fig. 428. Common buzzard, Buteo vulgaris. Leach. (Courtesy, Saunders: "Manual 

 of British Birds," London, Gurney & Jackson.) 



