Grooming, social bonding, and agonistic aiding in rhesus monkeys

Abstract

An analysis of simultaneous grooming bouts in a captive group of rhesus monkeys (Macaca mulatta) failed to provide evidence of competition to groom high ranking partners. Not only were grooming supplantations rare, but the highest ranking individuals performing grooming did not groom the highest ranking animals receiving grooming. Lower ranking partners, however, did more grooming in nonkin dyads. Grooming partners aided one another in agonistic episodes, but the individual receiving the aid did not groom the individual providing the aid more than vice versa. Kin dyads did aid and groom one another at greater than expected rates, but the aider did not receive the greater proportion of grooming in the dyad. Males participated in more grooming than expected, but their grooming was not related to aiding either with regard to one another or female partners. Animals that were targeted in joint aggression, or aided against, received significantly less grooming from their opponents. A general social relationship expressed in partner preferences, social grooming, and agonistic aiding better explained the observed pattern than any model based on the exchange of services for favors in different currencies.

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