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Through a combination of

  • Sighting (they don't call it a "bird's eye view" for nothing) features like rivers, Coastlines, and mountain ranges.

  • Monitoring Earth's magnetic field, apparently with their visual system and with tiny grains of a mineral called magnetite in their heads

  • Observing the stars

  • Using the sun for guidance

  • Smell

  • And probably following their neighbors (many birds migrate in large flocks)

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13y ago

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