The buzzing of a bee is caused by its wings beating. The wingbeats cause vibrations in the air that we hear as a buzz. Also, some bees can cause vibrations in their throat to cause pollen to drop from flowers. This we also hear as a buzz.
The average honey bee beats its wings at approximately 11400 bpm(beats per minute)- 180 every second, which causes audible vibrations in the air. These vibrations could be described as a hum, but are most commonly known as ‘buzzing’.
Unless you meant the question as a joke so I will say: Because they can’t whistle!
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