when siberian birds come in india.and after some days they go back in his country.why do not they forget his way.
They come and go back for so long and they dont forget their way when they go back...whyyy
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They can use the sun, for example, which means that they permanently "know" what time it is, in order to know the right direction on the basis of the sun's position. They are also sensible to the ultraviolet rays which penetrate the clouds but are invisible for human beings. Even the nocturnal birds use the position of the sun at sunset to know their position.
Nocturnal birds also use the stars. This has been proved by letting birds fly in a planetarium and changing the stars' position.
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