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In page Przewalski's horse:

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In 2011, Prague Zoo started a new project, Return of the Wild Horses. With the support of public and many strategic partners, yearly transports of captive-bred horses into the Great Gobi B Strictly Protected Area continued.[7] as of 2011, an estimated total of almost 400 horses existed in three free-ranging populations in the wild.[6] Prague Zoo has transported horses to Mongolia in several rounds in cooperation with partners (Czech Air Force, European Breeding Programme for Przewalski's Horses, Association pour le cheval de Przewalski: Takh, Czech Development Agency, Czech Embassy in Mongolia, and others). The zoo has the longest uninterrupted history of breeding Przewalski's horses in the world and keeps the studbook of this species.[citation needed]