Plants are strong, flexible, and springy, which makes them fantastic carriers of surface waves.[*4] Insects exploit that property, filling plants with their vibrational songs. Between treehoppers, leafhoppers, cicadas, crickets, katydids, and more, Cocroft estimates that around 200,000 species of insects communicate through surface vibrations. Their songs aren’t normally audible, and so most people are completely unaware that they exist. Those who become aware often get hooked.
