The thesis was accomplished with the assistance of many people, which may not be mentioned at all. Firstly, I would like to thank you very much my advisor; Asst. Prof. Piyakarn Teartisup that provide the knowledge, advice, suggestion, checking and correcting my thesis with attention at every step. Thanks also to my co-advisor; 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 the Department of National Park, Wildlife and Plant Conservation for support information and helping with collected field data. Thanks to Dr. George W. Archibald consultant for advice on research and knowledge of the Eastern Sarus Crane.
Finally, the special thanks for my family, especially my mother who passed away in their encourage and behind the success. Thanks to my teachers, my boss, my colleagues and someone who does not said name in this time that helping me to success
This thesis is supported financially by the Bureau of the Budget, Thailand and The National Research Council of Thailand