Chimpanzees sometimes approach members of their group that have been wounded in conflicts to groom them and lick their wounds. Likewise, after a fight between gorillas or bonobos, those involved in the fight are comforted not only by others who were involved, but also individuals who were not involved.

Apes have the ability to understand the feelings of suffering or sad companions, and to try to alleviate those feelings.

■References (Books, papers, Web articles, etc.)
Good Natured: The Origins of Right and Wrong in Humans and Other Animals　　Frans B. M. de Waal　Harvard University Press; Revised edition (October 15, 1997)
『暴力はどこからきたか——人間性の起源を探る』　第4章　サルはどうやって葛藤を解消しているか　　山極寿一　（NHKブックス、2007）

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■The References list of “Evolution of Human Sociality”