The Great Migrationhe Great Wildebeest Migration is the world’s largest land-based wildlife movement . Each year, over 1.5 million wildebeest, along with approximately 200,000 zebras and 300,000 Thomson’s gazelles, undertake a grueling 1,000-mile circular journey through the Serengeti-Mara ecosystem.This endless cycle of birth, movement, and survival follows seasonal rains as the herds search for fresh grazing grasses zebras eat the longer grasses, while wildebeest follow to feast on the fresh shoots that regrow after zebras have passed through.Why Do They Migrate?The migration is driven by one simple factor: rain and the availability of fresh grass . As the wet and dry seasons shift, so do the herds:Rainy seasons bring nutrient-rich grass to different parts of the Serengeti and Masai MaraDry seasons push the herds to areas where water and grass remain availableThe animals follow an ancient, circular route that has been traveled for millennia
The Migration Journey: A Month-by-Month Guide
The migration is a year-round phenomenon with distinct phases
January – March: Calving Season (Southern Serengeti, Ndutu Plains)Herds gather on the nutrient-rich short-grass plains of the southern Serengeti and Ngorongoro Conservation AreaNearly 500,000 calves are born within just three weeks around 8,000 births dailyPredators (lions, cheetahs, leopards, hyenas) are never far behind, making this one of the best times for wildlife viewingApril – June: The Great Trek North (Central & Western Serengeti)The “long rains” arrive, triggering the herds’ journey northwestRutting season begins males clash in competition for females, their aggressive grunts echoing across the plainsHerds move through the central Serengeti and western corridor toward the Grumeti RiverJuly – October: The Mara River Crossings (Northern Serengeti & Masai Mara)The herds face their greatest challenge: the treacherous, crocodile-filled Mara RiverThis is the most dramatic and famous phase of the migration—massive herds thunder into churning waters, risking drowning and crocodile attacksCrossings are unpredictable and unfold over months, at multiple points along the riverbank
November – December: The Return Journey (Southern Serengeti)Short rains summon the herds back southThey face the Mara River once more before returning to the calving grounds in the southern SerengetiThe cycle begins again, with the herds settling to graze and prepare for the upcoming calving season
Key Statistics
Wildebeest migrating – 1.5 million
Zebras migrating – 200,000
Thomson’s gazelles migrating – 300,000
Daily births during calving season – 8,000
Total calves born in a season – 500,000
Annual deaths during migration – 200,000
Distance traveled per year – 1,000 miles
