Two World Heritage Sites and two Biosphere Reservates have been established within this area. It's unique environment has enthused writers, filmakers as well as numerous photographers and scientists. The Serengeti ecosystem is one of the oldest on earth, the main characteristics of climate, flora and fauna have hardly changed in the past million years.
Serengeti is renown for the migration of animals. Every October and November, more than a million wildebeest and about 220,000 zebras travel south from the northern hills to the southern plains for the short tropical rains, and then journey west and north after the long rains in April to June. The animals' ancient instinct to move is so strong that no drought, gorge or crocodile infested river can hold them back. The Wildebeest migrate through a number of parks, reserves and protected areas and through a variety of habitat.