With their power and beauty horses have had a long association with humans. Today there are only two surviving subspecies of wild horse: Przewalski's horse, or Mongolian wild horse, and the common domesticated horse. A third subspecies, the Tarpan or Eurasian wild horse, survived up until the 1920s before becoming extinct.

The Critically Endangered Przewalski's horse has recovered from the brink of extinction and is the last true wild horse, only surviving in Mongolian reserves and national parks. However it is still not known from which subspecies our familiar domesticated horses are descended. Roaming herds of untamed domestic horses are also known as wild horses.

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