Researchers subsequently confirmed that, on Yakushima, larger groups were dominant over smaller groups. As their home ranges are small, Yakushima macaques frequently encounter other groups. These encounters are often hostile. This suggests that males on Yakushima may allow solitary males to enter (immigrate into) their groups so that they will fight with them in the hostile encounters with neighboring groups.
■References (Books, papers, Web articles, etc.)
『霊長類学を学ぶ人のために』 西田利貞・上原重男編 （世界思想社、1999）
『サルと歩いた屋久島』 山極寿一 （山と渓谷社、2006）
『野生ニホンザルの研究』 伊沢紘生 （どうぶつ社、2009）
「日本の霊長類－ニホンザル研究の歴史と展望」 山極寿一 （『日本の哺乳類学２．中大型哺乳類･霊長類』所収 pp. 29～49 （東京大学出版会、2008）]
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