Millions of shorebirds -- like these Western Sandpipers at rest for the moment-- migrate southward in August. By the time this year’s hatchlings have put on their first full set of feathers and plumped up for the journey, their parents have already flown south. How do the novices find their way? The young birds possess an inherited magnetic compass and also some ability to reckon using the sun and stars. But this year's experience will make next year's trip easier.
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