 Several populations have now been released into the wild.A cooperative venture between the Zoological Society of London and Mongolian scientists has resulted in successful reintroduction of these horses from zoos into their natural habitat in Mongolia; and , an estimated total of almost 400 horses existed in three free-ranging populations in the wild.In 2001, Przewalski's horses were reintroduced into the Kalamaili Nature Reserve in Xinjiang, China.