Their anatomy is almost exactly the same. Zebras and horses have a strap in their neck called the nuchal ligament. It is attached to the back of the skull and to long spines on the backbone. It helps keep their heads up and also helps lift the head up when zebra is feeding. It acts like a big rubber band.
Zebras have long necks to reach the ground.
Zebras and horses also have a special ligament in their leg called the suspensory ligament. It also acts like a rubber band, and helps the foot straighten out after the zebra takes a step. The first ungulates were called condylarths. These animals lived about 65 million years ago and went extinct about 35 million years ago. There were many types of condylarths.