This paper reviews recent work on reciprocal altruism in primates with the aim of highlighting
the roles that reciprocal partner choice may have had in the evolution of primate altruism …

Coalitionary support in agonistic interactions represents cooperation because intervening in
a fight is potentially costly to the donor of support but benefits the recipient. Here, we first …

In humans and obligatory social animals, individuals with weak social ties experience
negative health and fitness consequences. The social buffering hypothesis conceptualizes …

Why are men, like other primate males, usually the aggressors and risk takers? Why do
women typically have fewer sexual partners? In Why Sex Matters, Bobbi Low ranges from …

Altruism poses a problem for evolutionary biologists because natural selection is not
expected to favor behaviors that are beneficial to recipients, but costly to actors. The theory …

Social relationships in nonhuman primates result from investments that individuals make
while pursuing fitness-maximizing strategies. These strategies sometimes include social …

Cooperative behavior is a hallmark of the primate order. Cooperation is therefore an area of
intensive theoretical research in biology, anthropology, political sciences and economics, as …

Two goals in the study of evolutionary anthropology are to determine the factors that make
humans unique and to reconstruct the evolution of our behavior. As humans' closest living …

In 1964, WD Hamilton proposed a novel solution to the long-standing evolutionary puzzle:
why do individuals cooperate? Hamilton predicted that, if individuals possess the ability to …

Kin selection theory (KS) is widely invoked to account for the preferential treatment of kin—
nepotism—in primate societies. Because this idea is so pervasive the role of KS is often …