The majority of spiders are loners. But about 25 of them have adopted a more sociable strategy. Recent researches show that personality is influenced by the other spiders in the group and that spider communities gain strength through a division of labor, which is dictated by predilection: those in charge of defending the colony score high on tests of aggression, while those caring for the young are more docile. The result of these studies resonates with our own experience.