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Blacknecked cranes rest at the Napahai Nature Reserve in Tibetan Autonomous Prefecture of Deqen in southwest China's Yunnan Province, Nov. 10, 2019. (Xinhua/Hu Chao)

Blacknecked cranes rest at the Napahai Nature Reserve in Tibetan Autonomous Prefecture of Deqen in southwest China's Yunnan Province, Nov. 10, 2019. (Xinhua/Hu Chao)