Ferchi

Put a few thousand ants on to a pile of dirt and in a week they will have built a labyrinthine city inside it. If a flood hits the colony they can mesh their own bodies together into a raft the size of a dinner plate and ship themselves to safety. All done without blueprint or leader. How? Not because ants are smart. But because they know to follow simple rules. Three, to be exact. (And if ants can do this, so can robots).