Males enter the group, and leave again

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.)
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. 2949 (東京大学出版会、2008))

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