Abstract
The complexity and pervasiveness of human cooperation make it both species typical for humans and unique among animals. Although the scale and intricacy of cooperation vary greatly across time and culture, it is central to human life, making cooperation an important evolutionary topic. In evolutionary theory, cooperation is defined as interactions in which two or more organisms provide benefits for each other (West et al., 2011). These exchanges may or may not be simultaneous, and the benefits can be the same (food for food) or different (food for information). Those who successfully exchange benefits (e.g., food sharing, information sharing, a division of labor) obtain significant fitness advantages (Cosmides & Tooby, 1992).