i I ' I I 



UNITED STATES DEPARTMENT OF AGRICULTURE 



DEPARTMENT BULLETIN No. 1165 



WashiDjitoii, D. C 



Jul; 20, 1923 



REPORT ON BIRD CENSUSES IN THE UNITED STATES 

 1916 TO 1920 



MAY THACHER COOKE. Assistant in Biological Investigations 

 Bureau of Biolopcal Survey 



CONTENTS 



Page 



lalndnclion 1 



Meihods of taking bird KcsnsM 3 



Essentials of a utiifaclory censas 4 



More reports needed on certain areas 6 



Results of bird censuses north of Maryland and east of 



the Plabs 6 



Results of censuses from ronlbeastem States .... 9 



Results of censusoi &om weslen Stales ...... 10 



Page 



Some notable bird-censns results IS 



Relative abundance of certain species 21 



Density of bird population Z3 



Bird life of marshland li 



Bird life of the woodland 27 



Scarcity of birds in 191S 28 



Birds respond to protection 31 



Summary 33 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1923 



