How Migratory Birds Navigate Invisible Sky Highways

How do billions of birds travel thousands of kilometers without maps or GPS? What invisible force guides them across oceans without stopping?
How do they navigate? Could it be the sun? Yes, they use a "sun compass." What about at night? They read the stars. And most amazingly, can they sense Earth itself? Through magnetoreception, birds literally "see" magnetic fields.
But what are these invisible highways? They're called flyways—ancient corridors shaped by coastlines and wind patterns.
How do their bodies survive such journeys? Through hyperphagia, they double their weight in fat before departure.
Yet why are these routes now in danger? Light pollution, habitat loss, and climate change threaten these voyages.
So what can we do? Turn off lights, protect wetlands, and make windows bird-safe.
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