Singing penis

The loudest penis is that of a tiny European species of aquatic freshwater insect.

Water Insect Sets Noise Record With 'Singing Penis'

In a recent study published in the journal PLoS One, French and Scottish scientists have discovered that the 2mm long water boatman Micronecta scholtzi make the loudest sounds of any animal on earth relative to its body size. Although the sperm whale may be louder in sheer terms of decibels, when compared to size, the water boatman has all other animals beat.