Here's why:
* Domestication: Horses have been bred for speed and endurance for centuries, leading to specialized breeds like thoroughbreds and quarter horses.
* Physical Differences: While zebras are strong and agile, their legs are typically shorter and their build is more muscular. This gives them greater strength for quick bursts of speed, but they lack the long strides and leaner build that contribute to top-end speed in horses.
However, it's important to note:
* Wild vs. Domesticated: A wild horse might not be as fast as a trained racehorse.
* Species Variation: There are many different types of zebras, and some may be faster than others.
* Individual Differences: Just like humans, individual animals within a species can vary in speed and athleticism.
So, while the general answer is horses, there are some exceptions!