Every year, countless flocks of birds take to the skies in one of natures most remarkable spectacles - migration. This incredible phenomenon involves the regular, long distance movement of birds between their breeding and wintering grounds. Some species fly only a few hundred kilometres, while others travel across continents and oceans, covering tense of thousands of kilometres is year.
Migration is primerly driven by changes in seasons. When food becomes scarce during harsh winters, birds travel to warmer regions where they can find abundant insects, seeds, or fish. The Siberian crane, for instance, travels thousands of kilometres from the cold wetlands of Siberia to India's warmer lakes such as keoladeo National Park in Bharatpur and chilka lake in Odisha. The bar headed goose, another amazing traveler, is known to fly over the towering Himalayas at heights where oxygen levels are dangerously low - a feat that astonished even scientists.