Among non-human primates, the great apes and small marmosets living in South America occasionally share food among themselves. Interestingly, in species in which food sharing is seen between adults, the adults also give food to weaned infants and juveniles. In other words, it is thought that food sharing first appeared in adults caring for infants and juveniles, and that it then spread to sharing among adults.
■References (Books, papers, Web articles, etc.)
『「サル化」する人間社会』 第6章 言語以前のコミュニケーションと社会性の進化 山極寿一 （集英社、2014）
「こころの起源―共感から倫理へ」 山極寿一（『＜こころ＞はどこから来て、どこへ行くのか』所収 pp.155～200 河合俊雄・中沢新一・広井良典・下條伸輔・山極寿一 （岩波書店、2016））
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