Individuals occupying dominant and subordinate positions in social hierarchies exhibit
divergent behaviours, physiology and neural functioning. Dominant animals express higher …

Convergent evidence from many species reveals the evolutionary origins of human
friendship. In horses, elephants, hyenas, dolphins, monkeys, and chimpanzees, some …

The ability to recognize other individuals' mental states—their knowledge and beliefs, for
example—is a fundamental part of human cognition and may be unique to our species …

The scientific study of networks-computer, social, and biological-has received an enormous
amount of interest in recent years. However, the network approach has been applied to the …

There is much interest in the evolutionary forces that favored the evolution of large brains in
the primate order. The social brain hypothesis posits that selection has favored larger brains …

Highlights•Indirect connections are heritable and predictors of fitness in some
species.•Some animals recognize and may strategically manipulate third-party …

In any given species, cooperation involves prosocial acts that usually return a fitness benefit
to the actor. These acts are produced by a set of psychological rules, which will be similar in …

Highlights•Social cognition in animals relies on a suite of increasingly complex skills.•These
skills are targets of selection.•They reflect the selective pressures acting on individuals in …

To understand the primate origins of the human interaction engine, it is worthwhile to focus
not only on great apes but also on callitrichid monkeys (marmosets and tamarins). Like …

Individuals in many animal species are strongly motivated to form close social bonds and to
attend to the social interactions of others. Some animals may also recognize other …