Lakhs of migratory birds have made their way to Chilika Lake (Odisha) after a long flight of thousands of miles. Major bird congregations were spotted in wetlands of Nalabana Bird Sanctuary inside Chilika and Mangalajodi, a major village on banks of lake. During winter season, migratory birds fly across continents from Caspian Sea, Baikal Lake and remote parts of Russia, Mongolia and Siberia and flock to the marshy lands of Nalabana Bird Sanctuary inside Chilika Lake, which is spread across over 1000 sq. km.