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For scientists have shown that the insects talk to each other and are more intelligent than anyone ever realised. They discovered that ants communicate by stroking a natural 'washboard' on their abdomen with a body part that resembles a plectrum. Scientists had known for decades that ants make noises by rubbing ridges on their bodies.
Pheromones can be used in many ways by ants and other animals (including humans), but we are most interested in how ants use pheromones to direct each other through their environment---this particular task is closely related to the problem of directing the flow of information through a network.