Large numbers of griffon vultures follow the herds waiting for the old and weak to fall.
Thunderstorms are becoming common as the long rains are starting. It is thought that the wildebeest follow the lightning and thunderstorms in search of water. They continue eating as they move, and are scattered all across the plains, generally west of Ndutu. One day they will be all around and the next they could all have moved off, like a single entity. As the rains start to fall, the wildebeest canter off towards the storms, searching for water, Sometimes after a day or two, they return if the promise of water did not materialise.