44 



The Diseases of Animals 



the rabbits from burrowing out, the walls must be car- 

 ried down deep into the earth, or else the floor of the 

 yards must be paved or covered with chicken -wire. 



Fig. 13. Belgian hares 



Rabbits are fond of burrowing, and it is therefore 

 generally considered beneficial to have the floors of dry 

 earth. If the pens are kept well littered with straw or 

 similar material, the animals seldom dig much, but if 

 they once get access to the earth they will burrow rapidly. 



