By chasing B, A was not trying to support the lowest-ranked C, nor trying to intervene in the conflict between B and C. The reason for the intervention is that A feels a risk of losing the higher rank if A tolerates B’s expression of dominance to C in front of A.
In this way, each individual behaves in a selfish manner, recognizing the dominance rank relationships between oneself and others, and also among the others. This is the social intelligence of Japanese macaques.
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