Question

How do bees and mosquitoes create a loud buzzing noise?

Answer 1

they move their wings fast

Answer 2

The bees and mosquitos create a loud buzzing noises with the help of their wings. They are able to move their wings at such high rate of speed that the sound of buzzing and vibrations come out.

The fluffing of wings at high frequency enables the air to plug through their wings. This further generates the buzzing noises and cause vibration.