The importance of between-group competition in the social evolution of animal societies is
controversial, particularly with respect to understanding the origins and maintenance of …

Human warfare and intergroup aggression among primates have traditionally been
considered to be largely unrelated phenomena. Recently, however, chimpanzee intergroup …

The social factors that influence cooperation have remained largely uninvestigated but have
the potential to explain much of the variation in cooperative behavior observed in the natural …

Group-living animals often do not maintain territories, but instead have highly overlapping
ranges, even though in principle these are economically defendable. We investigate …

Group members do not always act cohesively when facing extra-group rivals. When benefits
such as group-defence are not monopolizable, it poses an economics problem: who should …

RIMATE SOCIALITY has many faces. Some callitrichines form small groups with just one
reproducing female and others who help care for her young. Hamadryas baboons (Papio …

2011). For example, in the case of collaboration, it is possible that actors gain more benefits
through collaboration than they would through working alone or abstaining from …

The idea that competition and aggression are central to an understanding of the origins of
group‐living and sociality among human and nonhuman primates is the dominant theory in …

This chapter focuses on the following three questions: how much time do different primate
species actually spend in social behavior? How much of this behavior is friendly and how …

Social organisms in many taxa cooperate to produce resources that are shared among
group members. Some cooperatively produced resources may be monopolized by …