¿What are ants and treehoppers "talking" about?

Description:

[taxonomy:binomial=Metheisa lucillodes] [taxonomy:family=Membracidae] Braulio Carrillo National Park, Heredia, Costa Rica. This video was made with a special microphone to record substrate-borne vibrations of treehoppers and ants. Perhaps there is communication between ants and treehoppers, since ants are known to guard treehoppers in exchange for their honeydew. A cool research project for someone in the future. . .