1. Center for Environmental Biology and Ecosystem Studies, National Inst. for Environmental Studies, Japan Tsukuba Japan
2. Tokyo Metropolitan Government Director for Wildlife Protection Hachijo Tokyo Japan
3. Jiyukikaku Abiko Japan
4. College of Agro‐Biological Resource Sciences, Univ. of Tsukuba Tsukuba Japan
5. Division of Intelligent Interaction Technologies, Faculty of Engineering, Information and Systems, Univ. of Tsukuba Tsukuba Ibaraki Japan
6. Dept of Restoration Ecology and Built Environment, Faculty of Environmental Studies, Tokyo City Univ. Yokohama City Kanagawa Japan
7. Japan Bird Research Association Fuchu Tokyo Japan