How do birds migrate without maps?

Perhaps you are in a place where winter has draped it with snow, and its freezing cold; you won’t find food there. However there are places in this world where it’s warm; and there is sunshine, and plenty of food. What will your instinct tell you to do? Would you have left for a warmer place as soon as autumn sets in?

You see, birds have wings, so they can fly over mountains, and seas to reach a place with a climate which suits them better. They cannot read maps like we do. Nor do they use a compass like us. The sun, and stars are the compasses of migratory birds. Some are guided by wind patterns. Mountains, rivers, and lakes serve as landmarks which guide birds through their migration route.

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Picture courtesy: https://pixabay.com/illustrations/birds-sea-mountains-sunset-dusk-6015728/ (Image by mohamed Hassan from Pixabay)