The Great Wildebeest Migration

One of the most sought-after experiences for wildlife and nature enthusiasts, the Great Migration is the ever-moving circular migration of over a million animals across the Serengeti-Mara ecosystem. The constant movement of columns of wildebeest, joined by a host of companions, follow an age-old route in search of grazing and water. After calving in the southern part of Tanzania's Serengeti near the Ngorongoro Conservation Area, the animals journey through the Serengeti up and around in a clockwise direction towards the Masai Mara in Kenya, before returning once again near the end of the year. Along the way, high drama is always present, as thousands of animals are taken by predators and thousands more are born, replenishing the numbers and sustaining the circle of life

Migration

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 journey along age-old migration routes. Hungry predators including lions, leopards, cheetahs, hyenas, wild dogs, 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 across into the Masai Mara in Kenya, and back again. The journey is beset with danger: young calves are snatched by predators, the slow is brought down by a pride of lions, brave beasts break legs on steep river slopes, crocodiles take their share of the stragglers, and the weak and exhausted drown.

The three groups of migrant grazers have different grass-eating habits: as one group eats the top of the tallest grass, the next group will eat away some of the medium-height grass, until finally it is almost completely eaten, and the herds move on. This means each group sticks to its kind with only a small overlap in their distributions. The grasses of the plains have the highest protein content in the whole of the Serengeti, as well as being high in calcium.
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.