Flightless birds were more common before human-driven extinctions – new study

Evolution towards flightlessness has been much more common through history than scientists once thought.

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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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