158 



MAMMALS 



Figure 176. — Camel. The Ship of the Desert. 

 In making long trips across the desert, the camel is able to go without 

 drinking. During these journeys, the hump grows smaller as the fat in 

 it is used as food. This food is gradually changed until part of it be- 

 comes water. We might say that the fat in the camel's hump is a 

 special water reservoir. 



Figure 177. — Buffalo. 

 These sturdy animals once roamed the plains in great numbers. 

 were not protected in park preserves, they would now be extinct. 



If they 



