Tymbal Organs: Male cicadas possess a pair of tymbal organs, which are specialized sound-producing structures located on the sides of their abdomens. The tymbals are elastic, drum-like membranes attached to powerful muscles.
Muscle Contractions: To make a sound, cicadas rapidly contract and relax these tymbal muscles. The quick vibrations cause the tymbals to buckle in and out, producing a clicking sound.
Resonance Chamber: The space between the tymbals and the abdomen of the cicada acts as a resonance chamber. It amplifies the sound and projects it outward, making it much louder.
Synchronized Chorus: While individual cicadas produce a relatively soft clicking sound, it is their collective efforts that create the cacophony of a cicada chorus. Thousands or even millions of male cicadas synchronize their tymbal muscle contractions, resulting in the chorus-like effect that can be heard from a great distance.
Amplification: The sound produced by the tymbals is further amplified by the natural environment, such as trees and vegetation, which act as natural sound reflectors. This enhances the overall sound and carries it over a wider area.
The frequency and volume of cicadas' sound can vary depending on the species and environmental factors like temperature. Certain cicada species can produce sounds that can reach up to 100 decibels, comparable to a loud motorcycle or power tool.
It's fascinating that male cicadas primarily produce these sounds to attract females for mating, creating an incredible natural orchestra during their emergence periods, which can occur every 13 or 17 years in different cicada species.
