PRAGUE -- The Prague Zoo is sending four more rare wild horses to Mongolia, part of its efforts to reintroduce the endangered species to its native habitat.

Since the first four Przewalski horses that the zoo moved to the western Mongolia last year have been doing well in their new environment, four mares are being flown Monday on a military plane from Prague to the Gobi B national park.

The Przewalski horse is native to the steppes of Central Asia and became extinct in the wild in the late 1960s.

It is listed as critically endangered by the International Union for Conservation of Nature and considered wild because it has never been successfully domesticated.

The zoo has been breeding the horses since it was founded in 1932.

Also on HuffPost: