Ngorongoro is famous around the globe as an echo of Eden. It is a 12-mile (19 km) wide volcanic crater, ringed with towering walls and sheltering forests, grasslands, fresh springs, a large lake, and a dazzling abundance of animals of all sorts. The sunken cone of the extinct volcano serves as a natural cradle for the wildlife, which remains in the vicinity year-round. Most of the activity is within the crater that is popular for bird watching, photography, walking safaris, and game viewing from a vehicle (4 wheel drive). There are 25,000 larger animals within the crater itself, mostly Zebra and wildebeest. However, this is undoubtedly the best place to see black rhino in Tanzania as well as prides of lion that include the magnificent black-maned males. There are lots of colourful flamingos and a variety of other water birds around the soda lake on the crater floor. More than a 100 species of bird not found in the Serengeti have been found in the crater. Other game: leopard, cheetah, hyena, elephants, warthog, impala, buffalo, hartebeest, eland and lots of other members of the antelope family and smaller mammals of sorts.