Question

what is the scientific reason behind birds migration

Answer 1

heya !!

◆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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HOPE IT HELPS U !!☺

Answer 2

Answer: Migration of birds take place for their survival. Change in the climatic conditions enable them to migrate.

For instance, during spring insect population increases in the northward along with increase in budding plants and huge nesting locations.  

Due to this birds migrate from southward to northward. But as soon winter arises, then due to decrease in insect population and food availability, birds again migrate southwards.