Migrating Birds Reset “Compasses” at Sunset, Study Says

Sunset is more than a thing of beauty for Swainson’s thrushes and gray-cheeked thrushes. It keeps them on course when migrating between their winter and summer homes, according to an international team of scientists.

The finding sheds further light on a question that has vexed scientists for years: How do birds navigate between nesting areas separated by thousands of miles with pinpoint accuracy?