CONTENTS 



CHATTHt W* 



IV. The Migration of Birds .... 61 

 Moulting — Why Birds Migrate — The 



Gathering Flocks — The Usual Move- 

 ment — The Travelling Shore Birds — 

 The World's Migrating Champion — 

 Perils of Migration — Keeping Migra- 

 tion Records. 



V. The Birds in Winter 82 



A Good Time for Field Walks — The 



Downy s Winter Quarters — Birds and 

 the Night — The Food Question in Win- 

 ter — When the Food Supply Fails — 

 Wild Fowl Destroyed in the Oil 

 Fields — Hunting Winter Birds. 



VI. The Economic Value of Birds . 101 

 A Government Report — Plagues of Insects 

 — Some Useful Birds — The Question 

 of the Weed Seeds — Dealing with the 

 Rodent Pests — The Terror That Flies 

 by Night — A Seldom Recognised Bless- 

 ing. 



VII. Civilization's Effect on the Bird 



Supply 120 



Number of Birds in the World — Number 

 in the Different States — Increase of 

 Farm-land Species — Effect of Forest 

 Devastation — Commercializing Birds 

 — Wild Pigeon — Ivory-billed Wood- 

 pecker — Labrador Duck — Great Auk 

 — Eskimo Curlew. 



[x] 



