Summary

The wildebeest migration, like a discernible thread, embraces and connects the Serengeti's ecosystem much as it has done for at least two million years. Upon the migration u and the rains u almost all things depend. Every year, with some seasonally dictated variations in timing and scale, over one million wildebeest leave the southern Serengeti's short grass plains in search of the grass and water they need to survive. During their annual pilgrimage they will travel some 2,000 miles devouring 4,000 tonnes of grass a day. A quarter of a million will be born; many will die. To the outsider it may appear to be a senseless exercise. Flooded rivers will be crossed with many wildebeest drowning. Calves will die u or be lost u crossing rain-swollen rivers and lakes. Diseases, poachers and predators will contribute to thinning the herds.