http://www.dailymail.co.uk/sciencete...alk-other.html
By placing 4mm microphones and speakers inside a nest of 400 red ants, a team of British and Spanish scientists were able to record the scraping sound of queens and play the sounds back to the workers.
Professor Jeremy Thomas, of Oxford University, who took part in the study, said: 'When we played the queen sounds they did "en garde" behaviour.
'They would stand motionless with their antennae held out and their jaws apart for hours --the moment anyone goes near they will attack.'
Some of the noises made by queens and workers were identical but both groups of ants also had their own unique sounds.