Noisiest penis

Illustration

Waterboatman, insect with the loudest penis. Credit

The water boatman (Micronecta scholtzi) is not only the loudest animal on the planet for its size, but it makes its 99.2 decibels sound by rubbing its penis on its abdomen in a process known as "stridulation". Scientists discovered this ability in insects collected from a river in Paris. They write:

very little is known about the sound produced by small arthropods living in freshwater habitats. Here we analyse for the first time the calling song produced by the male of a small insect, the water boatman Micronecta scholtzi. [..] The mechanism behind the intense sound production of M. scholtzi is not clearly identified. The sound is produced by rubbing a pars stridens on the right paramere (genitalia appendage) against a ridge on the left lobe of the eighth abdominal segmen

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