Swans seen on Yellow River in Qinghai, NW China

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Swans are seen at the bank of the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)

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Swans are seen on the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)

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Swans are seen on the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)

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Swans are seen on the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)

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Swans are seen on the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)

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Swans are seen on the Yellow River in Hualong Hui Autonomous County of Haidong City, northwest China's Qinghai Province, Dec. 2, 2020. (Xinhua/Zhang Long)