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The Mystery of Migration

Advantages of Migration

The Origin of Migration

Northern ancestral home theory

Southern ancestral home theory

Theory of photoperiodism

Theory of continental drift

When Birds Migrate

Movements of species and groups

Nocturnal and diurnal migration

How Birds Migrate

Speed of flight and speed of migration

Altitude at which birds travel

Orientation

Segregation during migration

Where Birds Migrate

Short and undetermined migrations

Variable migrations within species

Fall flights not far south of breeding ranges

Long-distance migrations

Routes of Migration

Wide and narrow migration lanes

The flyways

Atlantic oceanic route

Atlantic coast route and tributaries

Mackenzie Valley—Great Lakes—Mississippi Valley route and tributaries

Great Plains—Rocky Mountain routes

Pacific coast route

Pacific oceanic route

Arctic routes

Evolution of Migration Routes

Vertical Migration

Vagrant Migration

Perils of Migration

Storms

Aerial obstructions

Exhaustion

Influence of the Weather on Migration

Problems of Migration

Banding studies

Movements of residents

Migration of the white-throated sparrow

Migration of the yellow-billed loon

Conclusions

Appendix I— List of Birds Mentioned in the Text

Appendix II— Bird Banding

Bibliography

Index