- THE PRAIRIE HORNED LARK 
By Gayle B. Pickwell 
CONTENTS 
PAGE 
Introduction 1-2 
The bird 1 
The problem 1 
Acknowledgments 2 
History of the Prairie Horned Lark 3-23 
General 3 
Extension of range. 5 
Primitive range 21 
Migration 93-28 
Genera 93 
Summary of general migration 26 
Migration of sexes and individuals... oes: BO 
ummary of migration of sexes and fediviiunia, 28 
The Lark in autumn and in winter 29-34 
Flocking 29 
Habitats 29 
Associates 30 
Nightly quarters 31 
Food as ae 
Call notes col Be 
lights : 33 
Reproduction 34-113 
Breeding habitats 34-37 
General .. B4 
At Evanston, Il = 8 
At Ithaca, N. Y 37 
Song 38-49 
Sas f song. 38 
Monthly variation in song 38 
Variations in a nesting p period saeiass 
Variations throughout a . day 
The relation of the song of the Prairie ‘Horned eo 
Lark to that of other birds igae comin 
Descriptions of the SOQ n-ne . 
song... Coenen 
Quantitative studies of s Fite 
Height of the Lark in "fight song SLE eee 
Visibility of Lark in flight song 47 
Duration of flight songs... 
Number of songs per minute ‘during ‘the flight. 48 
Relation of singing male to incubating female... 48 
Summary of song... 49 
