The social organization of groups varies greatly across primate species, ranging from
egalitarian to despotic. Moreover, the typical or average size of groups varies greatly across …

What conditions favour egalitarianism, that is, muted hierarchies with relatively equal
distributions of resources? Here, we combine the hawk–dove and prisoner's dilemma …

Collective conflicts among humans are widespread, although often highly destructive. A
classic explanation for the prevalence of such warfare in some human societies is …

Group hunting is common among social carnivores, and mechanisms that promote this
behavior are a central topic in evolutionary biology. Increased prey capture success and …

Public goods are the key features of all human societies and are also important in many
animal societies. Collaborative hunting and collective defence are but two examples of …

Cluster analysis reveals a fractal pattern in the sizes of baboon groups, with peaks at∼
20,∼ 40,∼ 80 and∼ 160. Although all baboon species individually exhibit this pattern, the …

Conflicts of interest over resources or reproduction among individuals in a social group have
long been considered to result in automatic and universal costs to group living. However …

Group formation is a quite ubiquitous phenomenon across different animal species, whose
individuals cluster together forming communities of diverse size. Previous investigations …

What endogenous factors contribute to minority (Red Queen) or majority (Red King)
domination under conditions of coercive bargaining? We build on previous work …

Most human societies exhibit a distinct class structure, with an elite, middle classes, and a
bottom class, whereas animals form simple dominance hierarchies in which individuals with …