WHY do insects buzz?

In most cases, they have no specific organs for this; the buzzing, heard only during flight, comes simply from the fact that, while flying, insects flap their wings several hundred times per second. A wingbeat is an oscillating plate, and we know that any oscillating plate, sufficiently often, produces a tone of a certain pitch.

Scientists have determined that a housefly, for example, makes 352 wing strokes per second, a bumblebee 220, a bee 440, and a mosquito 550. For comparison, the propeller of an airplane makes on average about 25 revolutions per second.

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