Swans seen in Yellow River wetland in China's Qinghai

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Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

A swan is seen flying above the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

A swan is seen flying above the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)

Swans are seen in the Yellow River wetland in Guide County, northwest China's Qinghai Province, Dec. 21, 2018. (Xinhua/Wu Gang)