Evolutionary biologist Robert Trivers proposed a number of theories on evolutionary psychology, including why we engage in reciprocal altruism, the nature of sex differences, and parent-offspring ...

The classic example, eusocial insects, makes an appearance in Wilson’s book, but his focus is on altruism as embodied by human behavior. As ever, evolutionary history provides the context for his ...

Reciprocal altruism occurs where the roles of the donor and recipient are later reversed. This often occurs in social animals. For example, vampire bats feed only on blood. An individual cannot ...

If natural selection is survival of the fittest, why isn't everything a competition? Cooperation and competition have a fitness face off in game theory. Evolutionary games are often visually ...

Evolutionary biologist Robert Trivers proposed a number of theories on evolutionary psychology, including why we engage in reciprocal altruism, the nature of sex differences, and parent-offspring ...