The only national park in the world that almost borders the capital is Nairobi National Park. With its 117 square kilometers, this park is among the smallest national parks in Africa. The proximity of the capital Nairobi brought to park exceptional popularity but also challenges in preserving animals from poachers. The park is known for having the densest population of black rhinos, about 50 heads in this relatively small area. Lions, hyenas, ostriches, giraffes, gazelles, buffaloes, zebras, warthogs, and about 400 species of birds can be seen here.