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Shuhei Hayaishi
Laboratory of Animal Sociology, Osaka City University University Education Center, University of the Ryukyus
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Fumihito Shibata
Laboratory of Animal Sociology, Osaka City University Wakayama Shin’ai Women’s Junior College
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Takeo Kawamichi
Laboratory of Animal Sociology, Osaka City University Honmachi, Higashiyama, Kyoto 605-0981, Japan