The Great Migration is the largest overland wildlife movement on Earth, involving over 1.5 million wildebeest, hundreds of thousands of zebras, and other herbivores traveling across Tanzania and Kenya in a continuous, circular journey. The Great Migration is a year-round, cyclical movement of herbivores across the Serengeti-Mara ecosystem, driven by the search for fresh grazing and water. It is one of the most spectacular natural phenomena in the world, often called “the greatest show on Earth”