Zebras, like most herbivores, need to be extremely careful when using a waterhole. A crocodile may lurk in the water, and a lion or other predator may jump out of nearby bushes, taking advantage of the fact that zebras are tilted and do not look around. A moment of less attention can cost them the highest price, so using a water hole is a short pleasure and a small episode in the daily activity of the herbivore.