AVATER BIRDS 



281 



Division B. Carinat^ 



This group contains the birds with a keeled breast-bone. It 

 is usually cli-\'ided into seventeen orders by American ornitholo- 

 gists. The orders of birds are not well differentiated as compared 

 with the reptilian orders. The classification followed for Car- 

 inatse is that of Reed and Chapman in their "Color Keyto North 

 American Birds." 



WATER BIRDS 



Order I. Pygop'odes. — Auks, grebes, and loons are examples of 

 this order of marine birds. Their legs are situated far back on 

 the body, the feet are broadly webbed, and the bills are narrow. 

 They are good swimmers and divers, and some are good flyers. 



Fig. 229. — Great penguin (Aptenody tes patagon ica ) (After Tenney.) 



The penguins, of which there are about twenty-eight species, are found 

 in the Antarctic region and on the South American coast (Fig. 229). 

 When on land these birds rest on the whole metatarsus and assume an erect 

 attitude, their legs being situated very far back. They are famous swim- 

 mers and divers, but they cannot fly. Their wings are degenerate, being 

 really feathered flippers. These feathers in some species look more like 



