Wild geese fly over Yellow River Wetland in central China's Henan
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A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of cranes fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of cranes fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of cranes stand in Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)

A group of wild geese fly over Yellow River Wetland in Changyuan County, central China's Henan Province, Dec. 25, 2018. (Xinhua/Feng Dapeng)