The mass zebra migration of Botswana occurs twice a year, as herds of zebra move first from north to south, then back from south to north. They move with the seasons and the rainfall, always in search of fresh grazing land. The zebra will cover huge tracts of land, walking over 300 miles during the course of the migrations. Up to 30,000 animals will be on the move at any one time. While it’s not Africa’s largest migration, it is the largest in southern Africa, and the longest migration of any land animal in the world.