这是一个进化生物学模型。在这，代理人（奶牛）争夺自然资源（草）。奶牛，更成功让草繁殖更经常地，并将因此更进化成功。该模型包括2种奶牛，贪婪和合作。它显示了这些不同的策略时，互相竞争，在一个人口的发展随着时间的。-his is an evolutionary biology model. In it, agents (cows) compete for natural resources (grass). Cows that are more successful in getting grass reproduce more often, and will thus be more evolutionarily successful. This model includes two kinds of cows, greedy and cooperative. It shows how these two different strategies do when competing against each other within a population that evolves over time.