One-male group

[1][6] A study of savanna baboons (hamadryas ursinus) indicates that the one-male groups in this species are formed by fissioning.

Juveniles of the species, suspected to be young of the eight adult females, also joined the new one-male group.

[2] One of the costs of living in one-male groups is the killing of unweaned young by conspecific adult males.

[4] This is done to increase the reproductive success of the intervening males because the females are more likely to mate with them now that they need to produce new offspring.

[5] In addition, it can be said that males and females in a clan have feeding advantages compared to males and females in single one-male groups because it has been shown that the males and females in clans gain access to clumped food sources earlier than those in single one-male groups and that they spend more time with clumped food sources than the single groups.

[5] Studies of social interactions among golden snub‐nosed monkeys (Rhinopithecus roxellana) reveal that adult females tend to interact with each other, but they do not form strong social bonds with other females in the same one-male group.

[1] It has been shown that adult female golden snub-nosed monkeys do not form strong social relationships with the resident male in the one-male group.

[8] The most prevalent type of affiliative interaction seen in a study involving Sichuan snub-nosed monkeys (Rhinopithecus roxellana) is infant handling.