UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 720 — pe 
Contribution from the Bureau of Biological Survey 
HE. W. NELSON, Chief 
Washington, D. C. PROFESSIONAL PAPER: December 23, 1918 
FOOD HABITS OF THE MALLARD 
DUCKS OF THE UNITED STATES 
By 
W. L. MCATEE, Assistant Biologist 
CONTENTS 
Introduciion Southern Black Duck 5 
Mallard : ‘2 | Items of Vegetable Food Identified . . 
Black Duek 10 | Items of Animal Food Identified ... 
WASHINGTON 
GOVERNMENT PRINTING. OFFICE 
