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Mallards swim in the Lhasa River, southwest China's Tibet Autonomous Region, Dec. 24, 2017. The populations of bar-headed goose, ruddy shelduck and mallard have increased in Lhasa River. (Xinhua/Zhang Rufeng)
Mallards swim in the Lhasa River, southwest China's Tibet Autonomous Region, Dec. 24, 2017. The populations of bar-headed goose, ruddy shelduck and mallard have increased in Lhasa River. (Xinhua/Zhang Rufeng)