The Great Migration is the largest herd movement of animals on the planet. In fact, with up to 1,000 animals per km², the great columns of wildebeest can be seen from space.
The numbers are astonishing: over 1.2 million wildebeest and 300,000 zebra along with topi and other gazelle move in a constant cycle through the Serengeti-Mara ecosystem in search of nutritious grass and water. Guided by survival instinct, each wildebeest will cover 800 to 1,000km on its individual journey along age-old migration routes. Hungry predators including lion, leopard, cheetah, hyena, wild dog and crocs make sure only the strongest survive in this natural spectacle also known as ‘the greatest show on Earth.’
The circuit takes the animals from the Ngorongoro Conservation Area (although not into the Crater itself) in the south of the Serengeti in Tanzania, up through the Serengeti and across into the Masai Mara in Kenya and back again. The journey is beset with danger: young calves are snatched by predators, the slow are brought down by prides of lion, brave beasts break legs on steep river slopes, crocodiles take their share of the stragglers, and the weak and exhausted drown.
It is unclear how the wildebeest know which way to go, but it is generally believed that their journey is dictated primarily by their response to the weather; they follow the rains and the growth of new grass. While there is no scientific proof of it, some experts believe that the animals react to lightning and thunderstorms in the distance. It has even been suggested that wildebeest can locate rain more than 50km away.
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The Great Migration in January, February and March
Around January each year, the migration will be finishing a southward trek, moving along the eastern edge of the Serengeti and into the Ngorongoro Conservation Area. Here the plains are rich in nutritious grass, providing the herds with the best conditions for raising their newborn calves.
The Great Migration in April and May
After bearing their young in February and March, around April the wildebeest herds begin to drift northwest toward the fresher grass of the central Serengeti, drawing with them thousands of zebra and smaller groups of antelope. By May, columns of wildebeest stretch for several kilometres as the animals start to congregate by the Moru Kopjes, close to Dunia Camp, one of the few camps in the Serengeti that offers migration viewing at this time of year. Mating season begins toward the end of May and male wildebeest battle head-to-head. Throughout ‘the rut,’ the journey continues at leisure with the wildebeest, zebra and gazelle grazing as they go along.
The Great Migration in June and July
During June, the dry season starts with large concentrations of wildebeest in the Western Serengeti and on the southern banks of the Grumeti River. Each migrating animal must face the challenge of crossing the crocodile-infested river — the first of many daunting and tense river encounters.
As June moves into July, the hundreds of thousands of wildebeest and zebra continue to head north along the western edge of the park toward an even riskier barrier: the Mara River in the north of the Serengeti. These river crossings are arguably one of the most exciting wildlife events on Earth. They usually begin at the onset of high season in July, but timing all depends on nature.
The Great Migration in August, September and October
By August, the herds have faced the challenge of crossing the Mara River and are spread throughout the Masai Mara’s northern region, with many remaining in the northern Serengeti. In years when the river is in full flow, the panic and confusion at the crossings — combined with waiting predators and surging currents — can cause massive loss of life. But, even in years of relatively gently flowing water, the crocs take their toll, not to mention the lions and other large predators that patrol the banks, ready to ambush any wildebeest that make it to the other side.
By September to October, the main chaos has ended and the migrating columns have gradually moved eastward. However, they wildebeest will face the heavy waters of the Mara River once more as they prepare to cross once again for their return journey southward.
The Great Migration in November and December
After the East African short rains in late October and early November, the wildebeest move down from Kenya and into the eastern limits of the Serengeti past Namiri Plains, an area known for outstanding cheetah sightings. By December, they are spread throughout the eastern and southern reaches.