In chimpanzees and bonobos, lower-ranked individuals often beg for or take food from higher-ranked individuals, and the higher-ranked individuals may allow the lower-ranked to take some of their food. This kind of “passive” food sharing is rarely observed in Old World monkeys, such as Japanese macaques—even between mothers and their children.
■References (Books, papers, Web articles, etc.)
『サルの文化誌』 西田利貞･伊澤紘生・加納隆至編 （平凡社、1991）
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