All bees buzz when they fly. Some bees buzz to communicate while others buzz to pollinate plants, flowers, and crops.
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Bumble bees use their buzz to pollinate flowers and crops, which is vital to producing food for humans. In order for bees to release the pollen they collect, they buzz their bodies to shake it off. Without bees, humans may not be able to produce food at the scale we do.
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Why Do Bees Buzz? | ScienceTake | The New York Times