Although the migrations occur in a cycle between Tanzania and Kenya, most of the movement takes place in Tanzania which covers Serengeti National Park, Ngorongoro Conservation Area, Loliondo Game Controlled Area, and Grumeti Reserve. In Kenya the migration stretches to the Maasai Mara Game Reserve, bordering Serengeti National Park in the north.
From late November to mid-March, the wildebeest and other animals are already in the southern Serengeti and Ndutu in the Ngorongoro Conservation Area, mainly moving between the transitional borders of the two reserves.
It is calving season for wildebeest at this time of year. With lots of calves born in the area, a host of predators like lions, leopard, hyena and cheetahs are around as they take advantage of the easy prey.
- The Great Migration sees over 1.8 million wildebeest, 300,000 zebra and a host of other antelope travelling cross country.
- Between January and March, half a million wildebeest are born each year in the Serengeti. In February, the month with the highest calving rate, around 8,000 wildebeest are born each day.
- The Great Migration is the largest overland migration in the world. The animals travel a total of 1000 km or more during each cycle
- While the migration may seem like a chaotic frenzy of movement, research has shown a herd of wildebeest possess what is known as ‘swarm intelligence’, where the wildebeest systematically explore and overcome an obstacle as one.
- The reason why zebra and wildebeest graze in harmony together is because they each eat different parts of the same type of grass.
- Because wildebeest have no natural leader, the migrating herd often splits up into smaller herds that circle the main, mega-herd, going in different directions. When considering these smaller, split herds the whole migration can cover over half of the whole Serengeti.
- The Serengeti National Park eco-system is the oldest on the planet. It boasts a diversity of plants and animals that is unavailable anywhere else on the globe.
- During the migration around 300,000 wildebeest and 50,000 zebra are killed off every year as a result of predation by carnivores, but also from thirst, hunger, and exhaustion.
- The crocodiles awaiting the herds in the Mara River drown their prey by clutching them in their strong jaws and pulling them below the water, twisting them to break off bite-size pieces. A crocodile can lunge more than half of its body length out of the water to grab a potential victim and can also use its tail as a secondary weapon.
- There are more than 3,200 lions currently living in the Serengeti ecosystem that follow the migratory herds across the reserve.