UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 720 



Contribution from the Bureau of Biological Survey 

 E. W, NELSON, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



December 23, 1918 



FOpD HABITS OF THE MALLARD 

 DUCKS OF THE UNITED STATES 



By 



W. L. M CATEE, Assistant Biologist 



Introduction 

 Mallard 

 Black Duck 



CONTENTS 



Page 

 1 



2 

 , 10 



Southern Black Duck 



Items of Vegetable Food Identified 

 Items of Animal Food Identified . 



Page 

 . ,14 

 . 16 

 . 24 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1918 



