Whooper swans stand on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. A large number of wild whooper swans migrated to Ruoergai County to winter there. Nearly a hundred swans were freely foraging and playing on the huge lake, adding vitality to the frozen plateau wetland. (Photo/An Yuan)
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