Sound making amoung animals serves to aid in frightening away enemies or in warnng companions of their approach, for recognition among mates and members of a band or species. It also aids in the attracting and wooing of mates, and the interchange of information. The annoying, high-pitched, whining sound mosquitoes make is caused by their wings rapidly beating hundred of times per second. This diagram shows the auditory hairs on the antennae of a mosquito.
Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)