328 



ELEMENTARY ZOOLOGY. 



wings. Their legs are far back on the body and this gives 

 them an awkward upright position on land; it accounts, 

 however, for the ease of their swimming and diving 

 movements. The loons and grebes are found in the fresh 



FIG. 135. Ostrich (Struthio). From Wood's Natural History. 



Questions on the Figure. Which.of the types of feathers found 

 in ordinary birds become the plumes in the ostrich? What is the 

 real size of the ostrich ? 



waters, and the penguins, auks and puffins are marine. 

 The latter form nest in great numbers on the rocky 

 coasts, often being so thick as literally to cover the sur- 

 faces that are level enough to be occupied. The great 



