The thesis was accomplished with the assistance of many people which may not be mentioned at all. Firstly, I would like to worship my advisor; Asst.Prof. Piyakarn Teartisup that provide the knowledge, advice, suggestion, checking and correcting my thesis with attention in every step. Thank you to my co-advivor; Asst. Prof.Suwalee Worakhunpiset and Dr.Boripat Siriaroonrat for advice and guidance to support in the operation of research. Many thanks to the team of Eastern Sarus Crane project of Zoological park organization and staffs of Department of National Park, Wildlife and Plant Conservation for support helping to collected data. Thanks also to the Bureau of the Budget, Thailand and The National Research Council of Thailand for financial support of this study. Thank you very much for Dr. George W. Archibald consultant to advise on research and knowledge of the Eastern Sarus Crane.