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Male age, dominance, and mating success among rhesus macaques.

Some previous primate studies have found a positive correlation between male dominance and mating success when data from subadult males were included in the analyses. The information in this paper suggests that an unconscious bias may have been introduced when data on subadult males were included because of the lower dominance rank of these animals. Data from a study of rhesus monkeys on Cayo Santiago showed that subadult males mated significantly less than adults. Because these monkeys are not fully mature, data on them should not be used in any test for correlation between adult male dominance and mating success. The only significant correlation found for adult male mating success was an inverse one with relation to age. Based on behavioral data young, fully adult males have the best chance of fathering offspring regardless of their dominance rank.