The soft sound of bees buzzing among flowers signals warm weather throughout the world. But in many places, those sounds are fading. And it’s not just honeybees that are struggling. Native bees, including bumblebees, are also becoming scarce. Factors such as climate change and habitat loss may be partly to blame. But a new study points to the threat posed by a common pesticide. Bumblebees exposed to this chemical had a harder time learning. And it was true even when bees ate pesticide-laced food only as larvae.
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