Different kinds of birds seen in Gahai Lake wetland in Luqu County, NW China

A tern flies over the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

Bar-headed geese are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Zhang Keren)

Bar-headed geese are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Fang Xin)

A ferruginous duck is pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Fang Xin)

Bar-headed geese are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

Chicks of bar-headed goose are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

A tern forages on the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Zhang Keren)

A tern is pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

Bar-headed geese are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

A tern flies over the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

A tern flies over the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

Bar-headed geese are pictured in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

A ferruginous duck swims in the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Zhang Keren)

A cormorant flies over the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Chen Bin)

A tern flies over the Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, July 7, 2023. (Xinhua/Zhang Keren)