Ultrasound repellers could keep hedgehogs off roads, scientists hope

The Guardian - World NewsEN 2 min read 100% complete by Patrick BarkhamMarch 11, 2026 at 07:00 AM

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Researchers at the University of Oxford and University of Copenhagen have discovered that hedgehogs can hear high-frequency ultrasound, raising hopes for reducing road deaths. The study, published in Biology Letters, used electrodes to measure brainstem responses, confirming hedgehogs hear frequencies between 4 and 85kHz. Micro-CT scans revealed unique ear structures that facilitate ultrasound hearing. Scientists believe this finding could lead to the development of ultrasound repellers on vehicles, strimmers, and lawnmowers to deter hedgehogs from dangerous areas. The goal is to create devices that specifically target hedgehogs' hearing range without affecting pets, potentially mitigating the significant impact of vehicle collisions on declining hedgehog populations across Europe.

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Key Player Opposition Context

Biology Letters 40% University of Copenhagen 40% Europe 50% Denmark 60% University of Oxford ×270% Sophie Lund Rasmussen ×290%

Keywords

hedgehogs 100% ultrasound repellers 90% road deaths 70% ultrasound 70% hearing range 60% animal ears 50% wildlife conservation 50% high frequency 40%

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The Guardian - World News

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hedgehogs ultrasound repellers road deaths ultrasound hearing range animal ears wildlife conservation high frequency

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