Sabanilla de Montes de Oca, San José, Costa Rica With the help of a special microphone, we can listen to the substrate-borne vibrations of these treehoppers. Observe the movements of the abdomen as they produce the substrate-borne vibrations to know which treehopper is "talking".Three treehoppers of the species Ennya chrysura are standing below a leaf. On the right side, we see part of a female, and a male mounting and producing his courtship song. On the left side, there is another male producing his "siren" signal to "jam" the courtship of the other male. This way, he probably lowers the chances of success of the courting male, and perhaps gets a better chance of success himself. . .