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 …

Relatives have more similar gut microbiomes than nonrelatives, but the degree to which this
similarity results from shared genotypes versus shared environments has been …

Social relationships have profound effects on health in humans and other primates, but the
mechanisms that explain this relationship are not well understood. Using shotgun …

Aging, for virtually all life, is inescapable. However, within populations, biological aging rates
vary. Understanding sources of variation in this process is central to understanding the …

In social hierarchies, dominant individuals experience reproductive and health benefits, but
the costs of social dominance remain a topic of debate. Prevailing hypotheses predict that …

Research conducted in the last fifteen years has placed in question many of the traditional
conclusions scholars have formed about human female sexuality. Though conventional …

Sociality has positive effects on female fitness in many mammalian species. Among female
baboons, those who are most socially integrated reproduce most successfully. Here we test …

For social species, the environment has two components: physical and social. The social
environment modifies the individual's interaction with the physical environment, and the …

Competition for fertile females determines male reproductive success in many species. The
priority of access model predicts that male dominance rank determines access to females …