Reciprocity is the act of two parties mutually rewarding each other.
Reciprocal behavior is frequently seen among great apes. Since third parties often intervene in conflicts, great apes usually pay attention to their relationships with potential supporters. Companions are also expected to share food and help with grooming.
■References (Books, papers, Web articles, etc.)
Chimpanzee Politics: Power and Sex among Apes Frans de Waal Johns Hopkins University Press; 25th anniversary edition (September 30, 2007)
Peacemaking among Primates Frans B. M. de Waal Harvard University Press; First Thus edition (September 1, 1990)
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■The References list of “Evolution of Human Sociality”