Natural History of the Bell Vireo, Vireo bellii Audubon

CONTENTS

	PAGE
Contents	243
Introduction	245
Acknowledgments	245
Methods of Study	246
Study Area	247
Considerations of Habitat	248
Seasonal Movement	250
Arrival in Spring	250
Fall Departure	251
General Behavior	252
Flight	252
Foraging and Food Habits	252
Bathing	253
Vocalizations	254
Singing Postures	255
Flight Song	255
Daily Frequency of Song	255
Types of Vocalizations	255
Territoriality	258
Establishment of Territory	259
Size of Territories	259
Permanence of Territories	260
Maintenance of Territory	260
Aggressive Behavior of the Female	264
Interspecific Relationships	264
Discussion	265
Courtship Behavior	267
Displays and Postures	268
Discussion	270
Selection of Nest-site and Nestbuilding	272
Building	274
Gathering of Nesting Materials	276
Length and Hours of Nestbuilding	277
Abortive Nestbuilding Efforts	277
Renesting	277
The Nest	277
Egglaying and Incubation	278
Egglaying	278
Clutch-size	279
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