When you have a reason to run fast, you do. They are the favored prey of cheetahs and lions. Though their eyesight is poor, they travel in packs on land and ford rivers using “swarm intelligence” instinct, making it less likely to be slaughtered if they move as one. When necessary, they can reach maximum speeds of 80 km/hour. Still, they’re no match for their top predators which catch them with ease during the Serengeti migration.