CONTENTS 



Page. 



Introduction 5 



Cardinal '^ 



Distribution and habits 5 



Economic relations 6 



Vegetable food ^ 



Animal food 13 



Mineral matter 23 



Nestlings 23 



Summax-y 24 



List of seeds, fruits, and invertebrates eaten 25 



Gray grosbeak ^ 2S 



Appearance, distribution, and habits : 28 



Economic relations ^ 28 



Vegetable food 28 



Animal food 29 



^Mineral matter 31 



Summary 31 



List of seeds and invertebrates eaten 32 



Ro.se-breasted grosbeak 33 



Appearance, distribution, and habits _ 33 



Economic relations 34 



Vegetable food 34 



Animal food -12 



Mineral matter ^>^* 



Nestlings ^^ 



Summary 57 



List of seeds, fruits, other vegetable substances, and invertebrates 



eaten 58 



Black-headed grosbeak 60 



Appearance, distribution, and hal)its 60 



Economic relations 60 



Vegetable food ' 61 



Animal food --- 68 



Mineral matter 74 



Nestlings '^'^ 



Sunnnary 75 



List of seeds, fruits, and invertebrates eaten 76 



Blue grosbeak 78 



Api)earMnce. distribution, and habits _ 78 



Economic relations ' ,- 78 



Vegetable food - 79 



Animal food 81 



Mineral matter 83 



Young 84 



Summary 84 



List of seeds, fruits, and invertebrates eaten 85 



Uclations of grosI)eaks and other birds to parasitic insects 80 



General conclusion >■ 89 



3 



