Affiliation: | (1) Institute of Biological Sciences, University of Tsukuba, 305 Ibaraki, Japan;(2) Bird Control Laboratory, National Agriculture Research Center, 305 Ibaraki, Japan;(3) Engineering and Development Department, Nasu Denki-tekko Co., LTD., 5-28, Shinsuna 3-chome, Koutou-ku, T36 Tokyo, Japan |