JIM AMOS / SCIENCE PHOTO LIBRARY JIM AMOS / SCIENCE PHOTO LIBRARY
Przewalski's horse (Equus ferus przewalskii or Equus caballus przewalskii), the closest wild relative of the domestic horse (Equus caballus), grazes at the Bronx Zoo in New York. This species, also known as the Asian or Mongolian wild horse, has never been successfully domesticated, unlike mustangs, which were once domesticated but have now gone feral.
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