23 



The Bird 



each an individual method a niche into which it fits 

 perfectly in the great scheme of Earth's hungry creat- 

 ures. The snake-bird's prey is in the water of dense 



FIG. 168. Brown Pelican catching fish, showing bag-like distension of lower 

 mandible. (Sanborn : photographer. Courtesy of N. Y. Zoological Society.) 



swamps and bayous; cormorants and pelicans amicably 

 share inland lakes and tidal waters; while the haunt of 

 the gannet is the high seas. 



Even more closely related to each other are terns 



