258 A COURSE ON ZOOLOGY. 



its greater activity. The mule is more sedate than the 

 horse and stronger than the ass ; it supports heat better 

 than the first, and cold better than the second, and is a 



FIG. 199. 



RHINOCEROS UNICORNIS (from a photograph by Gambler Bolton, F.Z.S.). 



valuable animal in mountainous countries on account of 

 its firmness of foot. 



The zebras are smaller than the horse and larger than 

 the ass, resembling the latter in outline and proportions. 



