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Artículos sobre Earth's magnetic field

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Geese fly day or night, depending on when conditions are best. sharply_done/E+ via Getty Images

How do geese know how to fly south for the winter?

Geese honk loudly and point their bills toward the sky when they’re ready to start the migration. Here’s how they know it’s time, how they navigate and how they conserve energy on the grueling trip.

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