The most recent advances of artificial life scientific research are opening up a new frontier: the creation of simulated life environments populated by autonomous agents. In these environments artificial beings can interact, reproduce and evolve [4, 6, 15], and can be seen as laboratories toexplore the emergence of social behaviors like competition, cooperation, relationships and communication [3, 5, 7] . It is still not possible to approach a reasonable simulation of the incredible complexity of human or animal societies, but these environments can be used as a scientific orartistic tools to explore some basic aspects of the evolution [1, 2, 3, 9, 11, 12, 13, 14, 15, 16].