CONTENTS 

 Introduction xi 



Prologue 1 



CHAPTER I 

 The Living Bird 5 



CHAPTER II 

 Environment, Past and Present^ 45 



CHAPTER III 

 The Evolution of Migrations 90 



CHAPTER IV 

 Annual Migrations HI 



CHAPTER V 

 Summary 140 



Epilogue 145 



Index 147 



4149S 



