Photo taken on Jan. 17, 2021 shows black-faced spoonbills flying over a salt field in Ledong County, south China's Hainan Province. Several black-faced spoonbills, a critically endangered bird species, were spotted at the salt field on Sunday. Listed in the International Council for Bird Preservation bird red data book, 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/Pu Xiaoxu)