In fact, even today, humans form groups of various sizes and use different types of communication.

10–15 people is the same size as gorilla groups, enabling a resonant group in which the members can deeply empathize with each other. Sports teams, court juries, and government advisory boards are this size. Until recently, families were also this size. Groups of 30–50 people are easy to educate in school classes because they are able to function together without the group breaking up.

Groups of up to 150 people are organized not by their names, but by their memories of the “bodies” that they have previously cooperated with. Words are not essential for the formation of any of these groups.

■References (Books, papers, Web articles, etc.)
『家族進化論』　第5章・第12節　音楽から言語へ　　山極寿一　（東京大学出版会、2012）

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■The References list of “Evolution of Human Sociality”