Warthogs are seen at Nairobi National Park in Nairobi, Kenya, Feb. 23, 2025. Located about 7 kilometers south of the city center, Nairobi National Park is one of the world's few national parks located on the doorstep of a major city. It is a home for more than 100 mammal species and over 500 recorded bird species. (Xinhua/Li Yahui)