The Great Wildebeest Migration is the largest mammal migration in the world and one of the "Seven Natural Wonders of Africa". It’s a true spectacle of nature, with millions of wildebeest, zebras, and gazelles thundering across the endless plains of the Serengeti throughout the year in search of fresh grazing and higher-quality water. For many travelers, the epic crossing of the Grumeti and Mara Rivers is the ultimate highlight!