"Why do birds fly thousands of kms every year uncle", he asked me

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A school going boy asked me this question. "Uncle, why do birds fly so many thousands of kms and visit vedanthangal every year? (vedanthangal is a bird sanctuary near Chennai, India) I tried to recollect what I studied in my school days. I said, " they fly thousands of kms and visit vedanthangal every year from various countries as it is a suitable place for migratory birds. They find this place comfortable during the period between November and March as the climate, food availability etc suit their needs". I looked at him hoping to have cleared his doubts. But he did not seem to be happy with my answer. He said, " no uncle this is not the correct answer". "Well, if you know the correct answer tell me now", I said. "They fly thousands of kilometers because if they walk it will take a very long time". He simply winked at me and ran away before I could beat him.