74 YOSEMITE NATURE NOTES 



Foreword 75 



Distribution of Birds 75 



Life-zones of the Yosemite Region 76 



Parts of a Bird 77 

 How to Use This Book ' 78 



How to Study Birds 78 



Conservation of Birds 80 



Migration of Birds 81 



Acknowledgments 81 

 Bird Descriptions and Illustrations 82-139 



Flight Form, Birds of Prey 93 



Family Characteristics of Birds 140 



Identification Key to Yosemite Birds 146 



Index 151 



Cover illustration: male western tanager, from a 

 watercolor by Robert C. Stcbbins 



