Relative to its size, a male water boatman is the loudest animal on Earth. By rubbing their penis against their abdomen in an act called ‘stridulation’, they can generate sound of up to 99dB. That’s louder than a jackhammer or train whistle. Luckily for us (as at this level sound can damage human hearing) the sound is dissipated by water and humans can’t usually hear the melodic sounds of water boatman rubbing their penises.
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