On the grasslands of Africa, a fierce leopard can catch almost any antelope it decides to catch. And once the antelope is not targeted by the hungry leopard, its best chance of escape is that the leopard will soon find another animal as its target. Therefore, the antelope following the activities of the group can reduce the risk of being eaten by leopards.
 The hypothesis on which the above argument is based is that leopards live mainly by preying on antelopes.