XXXII THE HIPPOPOTAMUS 407 



been informed that the natives in some of the Polynesian 

 islands remove the ujjper tusks of tlie boars in order 

 tliat the lower tusks, lackin<i- antao'onists, shall jjrow in 

 a eircular manner and beeome valuable as charms. 



The hippopotamus uses its canines and incisors 

 like an agricultural spud for rooting up the grass 



The skull of a hippopotamus with the jaws opened 

 to display the teeth. 



and aquatic plants on which it feeds ; also for tighting 

 enemies and rival Intlls. Hippopotamuses are apt to 

 be quarrelsome, and travellers as well as sportsmen 

 mention that the hides of the cows, as well as those 

 of the bulls, are often well-scarred. 



When hunted or wounded, a hippopotamus will 



