Shhh, the Ants Are Talking - ScienceNOW.
Entomologists are "buzzing" about a new discovery that ant pupae communicate with sound. Previously, it was thought that the chemical pheromones placed by ants as they walk were the only way they communicated with each other. You know, "hey ant! Stay in line!" The ants have been found to use spikes on their bodies to scrape against their legs to create the sound. This ability developed in mature pupae, and continued in adults. So far, the tests have only been run on Northern European ants. God knows what the American Ants have been saying to each other.