Answers

2015-08-05T13:54:51+05:30
Migration (human) is the movement of people from one place in the world to another for the purpose of taking up permanent or semipermanent residence, usually across a political boundary.....

and siberian crane migrate because indian climate is comparatively hotter than siberian
and they are adjusted to hotter temperature....instead of freezing they prefer flying to 
India 
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