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.
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