- 75,344 viewsDuration: 10:11JEFF: What's the first thing you think about when it comes to South Sudan? War? Famine? Poverty? Did you know that South Sudan hosts the largest migration of land mammals on earth? OLIVE: And for the most part, it is completely unexplored. Jeff Koinange visited this marvel of a land and brings us this fascinating feature that will demystify many people's views of South Sudan.