A new study has revealed that male rhesus macaques have a unique sex trait that can be used to identify them. This trait, called the “coercive index,” is based on the macaque’s display of aggression towards other males in their group. Researchers found that males with a higher coercive index were more likely to succeed in mating attempts, suggesting that the trait could be used as an indicator of a male’s success in reproduction. This study provides a new insight into understanding the reproductive success of primates and could potentially help researchers to better understand and protect certain species.

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source: Phys.org