High Quality Content by WIKIPEDIA articles! The wildlife of South Sudan refers to the natural flora and fauna of South Sudan. South Sudan includes the Sudd, one of the world`s largest wetlands. According to the American biologist and conservationist, J. Michael Fay, South Sudan "could present the biggest migration of large mammals on earth", while Wildlife Conservation Society (WCS) reports southeast Sudan has a migration of 1.3 million antelopes. The region has a low density human population, with approximately 7 million people spread over approximately 619,745 km2 (239,285 sq mi).