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Social interactions between adult male and immature chimpanzees (Pan troglodytes) have been understudied compared to those between mothers and their offspring. This study’s aim was to gain a better understanding of such relationships among a population of wild West African chimpanzees (P. t. verus). Although overall rates of affiliation between adult males and immatures were low, low-ranking males engaged in such interactions significantly more than higher ranking males. Additionally, males tended to favor the offspring of certain females, although this difference was not statistically significant. It has been suggested that male care in many primate species may serve as a mating strategy. Unlike higher ranking males who engage in displays, low-ranking males may increase their ‘attractiveness’ to females by demonstrating their abilities as care-givers. This hypothesis may explain the findings of the current study; low-ranking chimpanzee males may direct affiliative behavior towards infants and juveniles to gain reproductive benefits.

Affiliative interactions between adult male and immature savanna chimpanzees (Pan troglodytes verus)