Other modern equids

Other members of the horse family include zebras, donkeys, and onagers. The Donkey, Burro or Domestic Ass, Equus asinus, like the horse, has many breeds. A mule is a hybrid of a male ass (jack) and a mare, and is usually infertile. A hinny is the less common hybrid of a female ass (jenny) and a stallion. Breeders have also tried crossing various species of zebra with mares or female asses to produce "zebra mules" (zorses, and zonkeys (also called zedonks)). This will probably remain a novelty hybrid as these individuals tend to inherit some of the undomesticated nature of their zebra parent, but they may inherit the zebra's resistance to nagana pest: zorses, also called zebroids, have been used in Central African game parks for light haulage.^{[citation needed}]

Behavior

Horses are prey animals with a well-developed fight-or-flight instinct. Their first response to threat is to flee, although they are known to stand their ground and defend themselves or their offspring in cases where flight is not possible, such as when a foal would be threatened. Through selective breeding, some breeds of horses have been bred to be quite docile, particularly certain large draft horses. However, most light horse riding breeds were developed for speed, agility, alertness and endurance; natural qualities that extend from their wild ancestors.

Horses are herd animals, and become very attached to their species and to humans. They communicate in various ways, such as nickering, grooming, and body language. Many horses will become flighty and hard to manage if they are away from their herd. This is called being "herd-bound". However, through proper training, it is possible to teach any horse to be comfortable away from the herd.

Horses within the human economy

Around the world, horses play a role within human economies, for leisure, sport and working purposes. To cite one example, the American Horse Council estimates that horse-related activities have a direct impact on the economy of the United States of over $39 billion, and when indirect spending is considered, the impact is over $102 billion.^[6]

In wealthier, First World, industrialized economies, horses are primarily used in recreational pursuits and competitive sports, though they also have practical uses in police work, cattle ranching, search and rescue, and other duties where terrain or conditions preclude use of motorized vehicles. In poorer, Third World economies, they may also be used for recreational purposes by the elite population, but serve a much wider role in working pursuits including farming, ranching and as a means of transportation. To a very limited extent, they are also still used in warfare, particularly in regions of extremely rugged terrain.

Sport

A youth competitor show jumping in Denmark

Horses are trained to be ridden or driven in many different sporting events and competitions. Examples include horse shows, gymkhana and O-Mok-See, rodeos, fox hunting, and Olympic-level events such as three-day eventing, combined driving, dressage, and show jumping. Although scoring varies by event, most emphasize the horse's speed, maneuverability, obedience and/or precision. Sometimes the equitation, the style and ability of the rider, is also considered.

Sports such as polo and horseball do not judge the horse itself, but rather use the horse as a partner for human competitors as a necessary part of the game. Although the horse assists this process and requires specialized training to do so, the details of its performance are not judged, only the result of the rider's actions -- be it getting a ball through a goal or some other achievement. Examples of these sports of partnership between human and animal also include jousting (reenacting the skills used by medieval knights), where the main goal is for one rider to dismount the other, and buzkashi, a team game played throughout Central Asia, the aim being to capture a goat carcass while on horseback. ^[7]

The most widely known use of horses for sport is horse racing, seen in almost every nation in the world. There are three types: "flat" racing; steeplechasing, i.e. racing over jumps; and harness racing, where horses trot or pace while pulling a driver in a small, light cart known as a sulky. Most race horses in the developed world are Thoroughbreds, a breed which can reach speeds up to 40 mph/70 km/h. In the case of a specialized sprinting breed, the American Quarter Horse, speeds over 50 mph have been clocked. In harness racing, performed by Standardbred horses, speeds over 30 mph have been measured. A major part of the economic importance of horse racing, as for many sports, lies in the gambling associated with it.

Wikipedia

http://en.wikipedia.org/w/index.php?title=Horse&action=history

http://www.gnu.org/copyleft/fdl.html