ODD-TOED UNGULATES. 5 I 



Horse. The size of different breeds ranges from the 

 Shetland Pony, weighing hardly 150 pounds, to the 

 Draught Horse, weighing nearly a ton. Equally great 

 are differences in speed and bodily proportions. 



The Ass is a native of the Old World, where it is 

 still found wild in Asia and northern Africa. It was 

 one of the earliest animals to be tamed by man. 



The striped Zebras, of which there are three or four 

 kinds, are all inhabitants of Africa. None of them 

 have ever been domesticated. 



The Rhinoceros. 



The Rhinoceros is readily recognized by the horn 

 placed on the nose. This horn differs in structure from 

 those of either the Deer or the Ox. In the Deer, the 

 horn or antler is made of true bone and is shed and re- 

 placed annually. In the Ox, the horn is developed 

 from the skin, is hollow, and is borne on a bony core. 

 It is not shed. The horn of the Rhinoceros is also per- 

 manent, but is composed of hair-like fibers fastened 

 together. In some kinds of Rhinoceros there are two 

 horns placed one behind the other. The forward horn 

 may be as much as four feet long. 



The animal has three toes on each foot. The skin is 

 very thick and is arranged in shield-like folds in the 

 Indian Rhinoceros. In the African forms this arrange- 

 ment is not found, though the skin is exceedingly 

 dense and is used by the nati\-es for shields. 



The Rhinoceros is the largest animal after the Ele- 

 phant. Some are over fifteen feet long and six or 

 more feet high. Even these, howex'er, probably weigh 

 but little more than the Hippopotamus. 



