SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 85, NUMBER 7 



EFFECTIVENESS IN NATURE OF THE SO-CALLED 



PROTECTIVE ADAPTATIONS IN THE ANIMAL 



KINGDOM, CHIEFLY AS ILLUSTRATED BY 



THE FOOD HABITS OF NEARCTIC BIRDS 



BY 



W. L. McATEE 



Bureau of Biological Survey 

 U. S. Department of Agriculture 



(PUBLICATION! 3125) 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 

 MARCH 15, 1932 



