In gorillas, if individual A intervenes in a fight between individual B and individual C, A approaches B and C and they stare at each other.

Among Japanese macaques, the act of staring at another individual’s eyes rarely occurs because it becomes a signal of threat, but it does not have that meaning among gorillas, and staring at each other occurs frequently in various contexts, such as conflict reconciliation, play invitation, courtship displays, and greetings.

■References (Books, papers, Web articles, etc.)
『ゴリラとヒトの間』　第5章　独特なコミュニケーション　　山極寿一　（講談社現代新書、1993）
「ゴリラの視覚コミュニケーション——他者を見ることの社会学的意味——」　　山極寿一（『視覚の進化と脳』所収 pp.205～224　　三上章允編　（朝倉書店、1993））

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■The References list of “Evolution of Human Sociality”