The Great Migration is one of nature's most spectacular events, with over 1.5 million wildebeest and hundreds of thousands of zebra making their annual circuit through the Serengeti-Mara ecosystem. ## Migration Timeline ### December - March The herds gather in the southern Serengeti for calving season. ### April - May As the rains end, herds begin moving northwest. ### June - July The herds reach the western Serengeti and prepare to cross the Grumeti River. ### July - October Peak Mara season with dramatic Mara River crossings. ### November Herds begin moving south back to Tanzania.