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Egrets are seen in the mangrove forest near the estuary in Dangjiang Township of Hepu County, along Lianzhou Bay in South China's Guangxi Zhuang Autonomous Region, Dec. 21, 2019. (Xinhua/Zhang Ailin)

Egrets are seen in the mangrove forest near the estuary in Dangjiang Township of Hepu County, along Lianzhou Bay in South China's Guangxi Zhuang Autonomous Region, Dec. 21, 2019. (Xinhua/Zhang Ailin)