what is migration? what is the scientific reason behind the migration
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The seasonal movement of a complete population of animals from one area to another. Migration is usually a response to changes in temperature, food supply, or the amount of daylight, and is often undertaken for the purpose of breeding. Mammals, insects, fish, and birds all migrate.
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THE SCIENTIFIC REASON BEHIND MIGRATION OF BIRDS ARE THAT THEY CANNOT CHANGE THEIR TEMPERATURE ALONG WITH OUTSIDE TEMPERATURE AND WITH THE CHANGE IN OUTSIDE TEMPERATURE, THEIR BODY TEMPERATURE FLUCTUATE. HENCE , TO PROTECT THEMSELVES FROM SUCH HARSH SUMMER OR WINTER CONDITIONS, THEY GO FOR MIGRATION
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