Social bonds predict future cooperation in male Barbary macaques, Macaca sylvanus
Social bonds have been construed as mental representations mediating social interactions among individuals. It is problematic, however, to differentiate this mechanism from others that assume more direct exchanges and interchanges of behaviour such as reciprocity, market effects or mutualism. We used naturally occurring shifts in rates and patterns of social interactions among male Barbary macaques […]
Social buffering of the cortisol response of adult female guinea pigs
When housed in spacious, mixed age/sex colonies, male guinea pigs form small harems of females with which attachment-like social bonds are established. A previous study indicated that the bonded male, but not an unfamiliar male from the same colony, could reduce the plasma cortisol response of a female when exposed to a novel environment. We […]
Differences in Titi Monkey (Callicebus cupreus) Social Bonds Affect Arousal, Affiliation, and Response to Reward
Titi monkeys (Callicebus cupreus) are a monogamous, New World primate. Adult pair-mates form a bidirectional social bond and offspring form a selective unidirectional bond to their father. Some of the neurobiology involved in social bonds and maternal behavior is similar to the neural circuitry involved in nonsocial reward. Due to these overlapping mechanisms, social states […]
Social bonds and rank acquisition in raven nonbreeder aggregations
Complex social life has been characterized as cognitively challenging and recently, social relationships such as long-term social bonds and alliances have been identified as key elements for brain evolution. Whereas good evidence is available to support the link between social relations and cognition in mammals, it remains unsatisfying for birds. Here we investigated the role […]
Consistent social structure and optimal clique size revealed by social network analysis of feral goats, Capra hircus
Social network analysis has become a valuable tool for the measurement of social bonds and can give insight into the level of social complexity in a species. However, most studies have focused on a single social group or community, and we have a rather limited understanding of the extent to which a species’ network structure […]
Pant hoot chorusing and social bonds in male chimpanzees
Vocal interactions, such as call exchanges or chorusing, are common behaviours in many animal species and their function has often been attributed to social bonding. However, few studies have investigated the effectiveness of vocalizations as bonding signals in comparison to other affiliative behaviours. We tested the hypothesis that male chimpanzee, Pan troglodytes schweinfurthii, pant hoot […]
Social dynamics among females and their influence on social structure in an East African chimpanzee community
Social structure in group-living animals is defined by the nature and patterning of social interactions among members of the society. Social structure is shaped in large part by kinship and competition among group members, but can also be influenced by affiliative interactions among both kin and nonkin and can vary based on sex differences in […]
Do friends help each other? Patterns of female coalition formation in wild bonobos at Wamba
Patterns of coalitionary aggression among female animals are generally explained by kin selection theory. Frequent female coalitions are almost exclusively observed in female-philopatric species, where females stay in their natal group, and females typically form coalitions with their kin. Bonobos, Pan paniscus, in contrast, are male-philopatric, with females emigrating to new groups at adolescence, but […]
Social play among juvenile wild Japanese macaques (Macaca fuscata) strengthens their social bonds
Social play and grooming are typical affiliative interactions for many primate species, and are thought to have similar biological functions. However, grooming increases with age, whereas social play decreases. We proposed the hypothesis that both social grooming and social play in juveniles strengthen their social bonds in daily activities. We carried out field research on […]