|Przewalski's Horse (Equus ferus przewalskii or Equus caballus przewalskii, classification is debated), pronounced in English as /??e'væl.skiː/, also known as the Asian Wild Horse or Mongolian Wild Horse, or Takhi, is the closest living wild relative of the domestic Horse.
Most "wild" horses today, such as the American Mustang or the Australian Brumbies, are actually feral animals, horses that were once domesticated but escaped and reverted to an apparently wild status. The Przewalski's Horse, on the other hand, has never been successfully domesticated and remains a truly wild animal today. There were once several types of equid that had never been successfully domesticated, including the Tarpan, Onager, and others. However, most have become extinct, with the Przewalski's Horse the only remaining truly wild horse in the world.