216 



BRANCH VERTEBRATA. 



upper canines recurved in a semicircle, thus serving, 

 as the animal rushes through the bushes, to protect the 

 eyes. 



FIG. 375. 



Sus babiru'sa. Babirusa Hog. 



The Hippopotamus of Africa is semi-aquatic, with 

 horizontally-projecting lower incisors and strong vertical 

 canines. A greedy feeder, it sinks to the bed of the 



FIG. 376. 



Hippopotamus ampfab'ius. Hippopotamus. (, l a .) 



sluggish stream, where it can remain six or eight min- 

 utes, digs up a quantity of aquatic vegetation, rises to 

 the top, and, washing the mass, devours it while leisurely 

 floating on the surface. It dredges the rivers, keeping 



