Treehoppers, a large family of insects found around the globe, live on plant branches, sucking nutrients from sap and frequently blending in with their surrounding to avoid the attention of predators. At first glance, the creatures appear rather boring as they stay relatively still and quiet much of the time, but scientists are learning that there’s much more to them than first meets the eye – or ear. By vibrating their torsos while grasping branches, treehoppers dispatch their own complex version of Morse code to warn of nearby predators, woo mates and even disrupt the signals of rivals. And treehoppers are hardly anomalous: tens of thousands of species of insects communicate using similar vibrations, meaning that there’s an entire universe of hidden animal communications we’re just beginning to understand.