Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel about to be released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

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Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

A staff member of the Qinghai Wildlife Rescue Center prepares to release kestrels to the wild in Xining, capital of northwest China's Qinghai Province, on July 31, 2020. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel after it was released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)

Photo taken on July 31, 2020 shows a kestrel about to be released to the wild in Xining, northwest China's Qinghai Province. Four kestrels, previously rescued by the Qinghai Wildlife Rescue Center, were released back into the wild on Friday. (Xinhua/Zhang Long)