Serengeti

[2] The Serengeti hosts the world's most massive [citation needed] land animal migration (in terms of total body weight), which helps secure it as one of the Seven Natural Wonders of Africa.

[7][8] For eons, African wildlife have roamed freely across the vast rolling plains of the Serengeti, which was sparsely inhabited by humans.

[10] By the mid-1970s, wildebeest and Cape buffalo populations had recovered and were increasingly cropping the grass, reducing the amount of fuel available for fires.

The initial phase lasts from about January to March, when the calving season begins – a time when there is plenty of rain-ripened grass available for the 260,000 zebras that precede 1.7 million wildebeest and the following hundreds of thousands of other plains game, including around 470,000 gazelles.

[15][16][17] During February, the wildebeest are on the short grass plains of the southeast part of the ecosystem, grazing and giving birth to approximately 500,000 calves in 2 to 3 weeks.

As the rains end in May, the animals start moving northwest into the areas around the Grumeti River, where they typically remain until late June.

The crossings of the Grumeti and Mara rivers beginning in July are a popular safari attraction because crocodiles are lying in wait.

[15] The herds arrive in Kenya in late July / August, where they stay for the rest of the dry season, except that the Thomson's and Grant's gazelles move only east/west.

[18] About 250,000 wildebeest die during the journey from Tanzania to the Maasai Mara National Reserve in southwestern Kenya, a total of 800 kilometres (500 mi).

The Serengeti is also home to a diversity of grazers, including Cape buffalo, African elephant, warthog, Grant's gazelle, eland, waterbuck, and topi.