From vast underground caverns, working class armies pour forth to defend their highly structured communal way of life. Feudal societies in the Middle Ages? No, ants. NOVA looks at the most successful life forms on the face of the planet in Little Creatures Who Run the World, hosted by the internationally renowned ant authority, Harvard University professor Edward O. Wilson. What's impressive about ants is how they practice what we preach: family values. All ants belong to extended families and carry their prey home to share. Unselfishness is the rule. Everything they do is for their colony's good. For them, socialism works.