Bats growl like a metal singer to communicate with each other, study reveals

, Daubenton’s bats have 7-octave vocal ability. This means that they can produce as much sound as a piano can. They are the only mammals whose echolocating and social cries have a frequency range between 1 and 120 kilohertz.

Researchers removed the larynxes from five adult Daubenton's bats, mounted them, and filmed them at 250,000 frames per second while applying a flow of air to simulate natural vocalization to better understand how different vocal structures enable bats to produce such a wide range of calls. The mobility of vocal membranes that were hidden by other components was then recreated using machine learning.

To produce high-frequency echolocation calls, they discovered that air pressure caused self-sustaining vibrations in the vocal membrane at frequencies between 10 and 70 kilohertz. However, the animals' lower-frequency social calls are likely produced by thick folds of a membrane known as the "ventricular folds," which were found to vibrate at frequencies between 1 and 3 kilohertz right above the vocal cords.

"We have directly filmed these vocal membranes for the first time. To show their vibrations, we needed to film at extremely high rates, up to 250,000 frames per second. We see many adaptations in the larynx that we think are responsible for the bat’s ability to make very high-frequency calls very fast so that they can catch insects while flying, " said Jonas Håkansson, another author of the study.

Source: Entertainment Trends (entertainmenttrends.net)

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