Migratory whooper swans winter in Sichuan(1/7)

Whooper swans stand on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

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.

A whooper swan spreads wings on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

Whooper swans stand on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

Whooper swans have fun on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

Whooper swans have fun on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

Whooper swans have fun on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)

A whooper swan spreads wings on a frozen river in Ruoergai County, Tibetan Qiang Autonomous Prefecture of Ngawa, Sichuan Province, Jan. 26, 2021. (Photo/An Yuan)