162 ANIMAL LIFE OF CARLSBAD CAVERN 



A few western robins were seen at Carlsbad on March 

 25, but most of these familiar birds go to higher eleva- 

 tions to breed, some of them even to the timberline 

 region of the mountains farther north in the state. 



Eastern bluebirds were common about the cave from 

 the time of my arrival on March 11, to about the middle 

 of April, when they left for cooler climates. 



