Since 2011-2013, ZPO was released the 46 of Eastern Sarus Cranes from the captive of Nakorn-ratchasima Zoo back to the natural wetland at the Huay-Jorakaemak and Sanambin reservoir by applied the reintroduction technique of the International Crane Foundation (ICF). the Eastern Sarus Crane populations that returned to nature must receive the training of reared by isolation technique, got health checked and prepared with the Gentle release technique.