Where do birds go for the winter, and when did we first figure out where they were disappearing to every year? Do they go to the moon, or are they off to fight battles with goat-riding armies? (Spoiler alert: Those theories are for the birds.) Joe Hanson of It’s Okay to Be Smart investigates bird migration, the seasonal journeys of our feathered friends to warmer climates.

Watch related videos: more kinds of migration, including TED Ed’s Bird migration, a perilous journey and Come fly with me: the physics of why birds fly in V-formation.

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