This week's subject: Bird migrationThis Thursday, the...

This week's subject: Bird migration

This Thursday, the swallows formally make their return to San Juan Capistrano. But how do they and other migrating birds find their way thousands of miles to their winter and summer grounds? Scientists have found they do it much the way man has historically navigated around the world: They are guided by the position of the sun and stars and landmarks. They also take note of distinctive smells and Earth's magnetic field. To learn more, use the links on The Times' World Wide Web site.

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