How do death metal singers create a low growl? The same way bats do – using a structure called false vocal folds that can produce lower-frequency grunts
Bats are known for their high-frequency calls, which they use to echolocate and catch prey, but they also let out much lower frequency calls for bat-to-bat communication. The structure in a bat’s larynx that lets them produce these sounds is the same one used by death metal singers to growl out low notes.
For decades, scientists speculated as to which structures in a bat’s larynx produce different frequencies. “But that was just through anatomical inspection,” says at the University of Colorado Colorado Springs. “And then we went ahead and said, ‘Well, is that actually the case?’” Håkansson and his colleagues affixed individual larynges dissected from Daubenton’s bats with a microphone and placed them under a microscope. They then funnelled air up through the larynx, simulating how it would travel out of a vocalising bat’s mouth. This airflow caused structures in the larynx to vibrate and produce sound, which the researchers captured with an ultra-high-speed camera.
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