Because of Zambia’s diverse landscape, plentiful water supplies, and position between Eastern, Southern and Central Africa, the diversity of animal species is huge. The rivers, of course, support large populations of hippos and crocs, and the associated grasslands provide plenty of fodder for herds of zebras, impalas and pukus (antelopes common in Zambia, but not elsewhere). Other antelopes found in Zambia include waterbuck and lechwe; in fact, vast herds of rare black lechwe live near Lake Bangweulu, and endemic Kafue lechwe settle in the area around the Kafue River. Kasanka National Park is one of the best places on the continent to see rare water-loving antelopes called sitatungas. Two more endemic species are Thornicroft giraffes and Cookson’s wildebeests, both found in South Luangwa National Park.