“Similarly, wings didn’t suddenly appear in all their aerodynamic glory. They developed from organs that served another purpose. According to one theory, insect wings evolved millions of years ago from body protrusions on flightless bugs. Bugs with bumps had a larger surface area than those without bumps, and this enabled them to absorb more sunlight and thus stay warmer. In a slow evolutionary process, these solar heaters grew larger. The same structure that was good for maximum sunlight absorption – lots of surface area, little weight – also, by coincidence, gave the insects a bit of a lift when they skipped and jumped. Those with bigger protrusions could skip and jump farther. Some insects started using the things to glide, and from there it was a small step to wings that could actually propel the bug through the air. Next time a mosquito buzzes in your ear, accuse her of unnatural behaviour. If she were well behaved and content with what God gave her, she’d use her wings only as solar panels.”
― Yuval Noah Harari, Sapiens: A Brief History of Humankind
Hughes microphone with recorded fly. The same fly whose footstep was amplified by Hughes's carbon microphone in 1878 to make it audible circles between the left and right channels in Pink Floyd's "Ummagumma."
― Friedrich Kittler, Gramophone, Film, Typewriter, Stanford University Press, 1999. Quote and image from Kittler, p.102
In the PDF (below) a general map and a systematic list of the frequencies of the insect world scanned from Olavi Sotavalta's dissertation (12.7.1947) entitled The Flight-Tone (Wing-Stroke Frequency) of Insects published in the series Acta Entomologica Fennica.