CONTENTS 



PART I 

 The Value of Birds 



A. THEIR ESTHETIC VALUE AS A SUBJECT FOR STUDY 



I. BIRD TRAVELERS 1 



Discovery of America Changes due to migration 

 Regularity of migration Distances birds travel 

 Winter homes Speed and height Routes of migra- 

 tion How birds find their way Causes of migra- 

 tion. 



II. BIRD Music 13 



Why birds sing Season of song Time of day of 

 song Music of songs Methods of recording songs 

 Similarity to human music Classification of songs 

 Variations in songs Call-notes. 



III. BIRD HOMES 26 



Time of building Location of nests Materials 

 Shape Time occupied in building Nesting-habits 

 of cowbird Number of broods Change in nesting- 

 habits. 



IV. HOME LIFE OF BIRDS 33 



Eggs Incubation Condition of young when 

 hatched Feeding young Brooding young A house 

 wren's day Care after leaving nest Enemies of 

 nestlings. 



V. COLORS AND PLUMAGE OF BIRDS 44 



Moulting Change due to wear Changes in color 

 Differences due to sex Protective coloration. 



VI. How TO KNOW THE BIRDS 48 



Attractions of bird-study Identification of birds 

 Where to find birds When to find birds How to 

 study birds What to study Bird-photography 

 Table of fifty common land-birds. 



