Original: The Przewalski's Horse is considered the only remaining truly wild "horse" in the world and may be the closest living wild relative of the domesticated horse, Equus caballus.
Simplified: The Przewalski's horse (Equus przewalskii or E. caballus przewalskii), also known as the Mongolian Wild Horse, or Takhi, is the closest living relative of the Domestic Horse and may in fact be the same species.