There are many fun facts about horses, such as they can sleep standing up and are one of the fastest mammals on Earth. The top-recorded speed of a horse is 55 miles per hour. In fact, a mare can run only an hour after giving birth.
Horses are herd animals, living in groups of between three and 20 individuals in the wild. Although horses have been domesticated for at least 5,000 years, many feral horses called mustangs run wild in North America. They were originally descended from horses brought to the Americas from Spain centuries ago. Only one species of horse was never domesticated, and it is Przewalski's horse. It used to roam the wild in the Mongolia area, although now they only live in captivity.
The Arabian horse is one of the oldest horse breeds, most likely having been bred by the Bedouins up to 4,500 years ago. Arabian horses have a unique skeletal structure from other breeds with one less vertebrae, wide and deeper rip and uniquely shaped heads. This horse was bred to survive in desert environments. It is also the mother breed for many subsequent light horse breeds. Arabian horses are known for their intelligence, high tail carriage and graceful gaits.