Gahai Lake wetland becomes home for endangered migrant bird species

A whooper swan is seen in Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, June 2, 2021. 

Bar-headed geese are seen in Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, June 2, 2021. 

Aerial photo shows black-necked cranes in Gahai Lake wetland in Luqu County of the Tibetan Autonomous Prefecture of Gannan, northwest China's Gansu Province, June 2, 2021. 

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