THE ANTELOPE CHIPMUNK 105 



day they are resting under the cool rock ledges 

 along the mountain bases. 



As one rides over the desert one often hears 

 the ammos' high-pitched, quavering call. It is 

 so shrill and so prolonged that one can hardly 

 believe that it comes from so tiny an animal. 

 It may last for several seconds and only dimin- 

 ish in intensity and volume during the last 

 phase, sounding then as though the little crea- 

 ture who makes it was losing his last vestige of 

 breath. Since the call carries so far and pos- 

 sesses ventriloquistic qualities, it is exceedingly 

 untrustworthy as a means of locating the ani- 

 mal. 



