Humans grow more slowly than great apes and have shorter birth intervals. Like marmosets, therefore, it is a feature of humans to have many dependent children. It is believed that this feature promoted joint child-care and food sharing. In addition, leaving the forest for the dangerous grasslands led our human ancestors to face a shortage of food and become easily targeted by carnivores. These hazardous conditions must have promoted food sharing and enhanced empathy.
■References (Books, papers, Web articles, etc.)
『家族進化論』 第2章・第18節 平等な社会 山極寿一 （東京大学出版会、2012）
「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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