MAMMALIA 



273 



that at intervals 

 " drives" are held. 

 On these occasions 

 as many as twenty 

 thousand animals 

 are slain in one 

 day. 



Bats and Flying- 

 Foxes (Chiroptera). 

 Unlike most of 

 the rodents, the 

 greater number of 

 the chiroptera are 

 beneficial on ac- 

 count of the harm- 

 ful insects they 



destroy. They are nocturnal and spend the day in caves 

 and forests. The bones of the fingers are much extended 



FIG. 309. Woodchuck or ground hog. Photograph 

 one fourth life size. 



FIG. 310. The red bat photographed from beneath. Half life size. 



