Black-necked cranes seen at nature reserve in Tibet

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Black-necked cranes are seen at a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Zhang Rufeng)

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Black-necked cranes are pictured at a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Zhang Rufeng)

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A black-necked crane hovers over a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Huang Huo)

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Black-necked cranes hover over a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Huang Huo)

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Black-necked cranes are pictured at a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Huang Huo)

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Black-necked cranes hover over a nature reserve in Lhunzhub County, Lhasa, southwest China's Tibet Autonomous Region, Dec. 12, 2020. Established in 1993, the nature reserve in Lhunzhub County attracts an increasing number of black-necked cranes to spend winter here. (Xinhua/Zhang Rufeng)