For more than 10,000 years, takhi roamed the steppe that once stretched from the Iberian Peninsula (southwest tip of Europe) to Manchuria on the east coast of China.
In the early 1900s, zoo collectors contributed to the species' decline by killing hundreds of adult takhi just so they could capture the much slower foals (young) for their exhibits.
A group of Dutch scientists in the late 1970s discovered there were only 300 takhi remaining in zoos and private collections around the world.
Before the zoo-bred takhi could be released, they had to be trained to live in the wild again.
Despite the reintroduction successes, takhi still aren't in the clear.
The reintroduction program has done more than bring takhi back to Mongolia.