Final answer:
In primate social groups, males often move between groups as part of their mating strategy, in contrast to the more stable groups of related females. Females can also leave their birth groups to mate in some species like gorillas and chimpanzees.
Step-by-step explanation:
In primate social groups, it is commonly observed that males are the ones who often move between groups. This movement is part of their strategy for gaining access to mates and can involve periodically leaving their natal community to join a new one. Such a pattern contrasts with the more stable groups composed mainly of related females, where female kinship and solidarity play a central role in the social structure. The males are essentially temporary members who may compete or cooperate with other males in the new group upon transfer.
In species such as gorillas and chimpanzees, female primates are seen to leave their birth groups when they are ready to mate, while in some other species, like orangutans, adults are generally more solitary. Across various primate species, these behaviors highlight the complex social organization and strategies that both males and females engage in for survival and reproduction.