ANSWERS: 2
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Instinct?
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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 guidance from fellow neighbors i assume its da same for us human beings to find our way home as well..
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