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Migratory birds are seen on a lake at Narja village, some 120 kilometers away from Kolkata, India on Jan. 10, 2018. (Xinhua Photo/Tumpa Mondal)

Migratory birds are seen on a lake at Narja village, some 120 kilometers away from Kolkata, India on Jan. 10, 2018. (Xinhua Photo/Tumpa Mondal)