How do birds come to know when and where to migrate?
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All migrating birds, over time, develop a mental map, allowing them to follow waterways and landmarks.
The sun and the stars also help.
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that's all natural... as we come to know when we r hungry.. or any other need... so do birds..
And where to migrate that many natural things like sun, stars , moon help..
And where to migrate that many natural things like sun, stars , moon help..
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