Why do some animals live in groups, but they don't cooperate with Qi Xin to resist foreign enemies? For example, zebras, zebra herds will only run away when they meet tigers to hunt, and will not unite? Zebras are just like ordinary horses we see. For tigers, they are all weak and have no resistance. Their weapon is the kick. Tigers mainly pinch zebras' throats, so the zebra's back kick is of little use to tigers.

Zebras can only run away when they see tigers, and tigers usually eat old, weak and sick zebras.

Young zebras run fast, old and weak run slowly, and will be eaten by tigers. As long as a tiger has meat to eat, it won't chase the next one.

So zebras can't unite to fight tigers.