On Yakushima, non-group-member males frequently appear around groups during the mating season. These include not only solitary males, but also males which have temporarily separated from other groups. Such temporary separation by males rarely occurs among Japanese macaques on Honshu, including those on Kinkazan.
■References (Books, papers, Web articles, etc.)
『ニホンザルの自然社会―エコミュージアムとしての屋久島』 高畑由起夫・山極寿一編 （京都大学学術出版会、2000）
「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. 高槻成紀・山極寿一編 （東京大学出版会、2008））
『サルと歩いた屋久島』 山極寿一 （山と渓谷社、2006）
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