Two black-faced spoonbills fly near the Dongzhaigang national nature reserve in Haikou, south China's Hainan Province, Aug. 12, 2020. The black-faced spoonbill is one of the most endangered birds in the world, due to its limited distribution area and extremely rare population. (Xinhua/Yang Guanyu)

Two black-faced spoonbills are seen in a pond near the Dongzhaigang national nature reserve in Haikou, south China's Hainan Province, Aug. 12, 2020. The black-faced spoonbill is one of the most endangered birds in the world, due to its limited distribution area and extremely rare population. (Xinhua/Yang Guanyu)

A black-faced spoonbill flies near the Dongzhaigang national nature reserve in Haikou, south China's Hainan Province, Aug. 12, 2020. The black-faced spoonbill is one of the most endangered birds in the world, due to its limited distribution area and extremely rare population. (Xinhua/Yang Guanyu)

Two black-faced spoonbills are seen in a pond near the Dongzhaigang national nature reserve in Haikou, south China's Hainan Province, Aug. 12, 2020. The black-faced spoonbill is one of the most endangered birds in the world, due to its limited distribution area and extremely rare population. (Xinhua/Yang Guanyu)

Two black-faced spoonbills are seen in a pond near the Dongzhaigang national nature reserve in Haikou, south China's Hainan Province, Aug. 12, 2020. The black-faced spoonbill is one of the most endangered birds in the world, due to its limited distribution area and extremely rare population. (Xinhua/Yang Guanyu)