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)

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)

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)

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)

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)