. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. July 20, 1923 TtEPORT ON BIRD CENSUSES !N THE UNITED STATES 1916 TO 1920 By MAT THACKER COOKE, Assistant in Biological Investigations Bureau of Biological Survey CONTENTS Page Introduction 1 Methods of lakino bird '.eesnses 3 Essentials of a satisladory census 4 More reports needed on certain areas 6 Results of bird censuses nortii o Maryland and east of the Plains 6 Results of censuses from southeastern Stales .... 9 ResaJls of censuses from western Stales 10 Page Some notable bird-centu results 15 R
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. July 20, 1923 TtEPORT ON BIRD CENSUSES !N THE UNITED STATES 1916 TO 1920 By MAT THACKER COOKE, Assistant in Biological Investigations Bureau of Biological Survey CONTENTS Page Introduction 1 Methods of lakino bird '.eesnses 3 Essentials of a satisladory census 4 More reports needed on certain areas 6 Results of bird censuses nortii o Maryland and east of the Plains 6 Results of censuses from southeastern Stales .... 9 ResaJls of censuses from western Stales 10 Page Some notable bird-centu results 15 Relative abundance of certain specie* 21 DensUy of bird population 23 Bird life a! marshland 24 Bird life of the woodland 27 Scarcity of birds in 1913 28 Birds respond to protection 31 Summary 33 WASHING! UN GOVERNMENT PRINTING OFFICE 1923. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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