The “takeover” of the highest rank found on Yakushima is seldom observed in other populations of Japanese macaques. In other areas, solitary males enter the group as the lowest-ranking male, and then gradually rank up as higher-ranking males emigrate from the group. Eventually, they too also emigrate from the group. On Yakushima, too, males which take over a group will eventually leave after staying with the group for several years.
■References (Books, papers, Web articles, etc.)
『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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