How are horses and zebras similar?

Well, they are cousins. They both eat grass, they both have a single toe, or hoof, on each foot. They both live in herds, and they both give birth to 1 foal (live twins are 1 in 50,000 for horse and I'm sure similar for zebras). And they both have manes and tails, although they look different. And zebras can be trained, ridden, and driven just like horses, but they are quite difficult to train.