Researchers are exploring the potential of using ultrasound technology to protect European hedgehogs from being struck by vehicles, a significant threat to the species’ declining population. A new study has confirmed that hedgehogs can hear high-frequency sounds, opening the door to the development of sound-based deterrents that could keep them away from roads.
Up to one in three hedgehogs in local populations die on roads each year, making vehicle collisions a major factor in their decreasing numbers. The International Union for Conservation of Nature (IUCN) recently classified the European hedgehog as “near threatened” in 2024, highlighting the urgency of finding effective conservation strategies. This research, published in the journal Biology Letters, represents a crucial step towards mitigating this risk.
Hedgehogs and Ultrasound: A Newly Discovered Sensitivity
The study, conducted by researchers at the University of Oxford and the University of Copenhagen, revealed that hedgehogs can detect sounds across a range of 4-85 kilohertz (kHz), with peak sensitivity around 40 kHz. Researchers tested the auditory brainstem response of 20 rehabilitated hedgehogs from Danish wildlife rescue centers, using electrodes to record electrical signals as they were exposed to different sound frequencies. This discovery challenges previous assumptions about hedgehog hearing and suggests a novel approach to protecting them.
Assistant Professor Sophie Lund Rasmussen (Wildlife Conservation Research Unit/Department of Biology, University of Oxford and University of Copenhagen) explained the potential impact of this finding. “Having discovered that hedgehogs can hear in ultrasound, the next stage will be to find collaborators within the car industry to fund and design sound repellents for cars,” she said. “If our future research shows that it proves possible to design an effective device to keep hedgehogs away from cars, this could have a significant impact in reducing the threat of road traffic to the declining European hedgehog.”
How Ultrasound Repellents Could Work
The concept involves integrating ultrasound emitters into vehicles. When a hedgehog is detected nearby, the device would emit a high-frequency sound, inaudible to humans, that deters the animal from crossing the road. Researchers are also investigating whether hedgehogs employ ultrasound to communicate with each other or to detect prey, as bats do. Popular Science notes that this line of inquiry could further illuminate the role of ultrasound in hedgehog behavior.
While the technology is still in its early stages, the initial findings are promising. The challenge now lies in developing a repellent system that is both effective and practical for widespread implementation. This requires collaboration between researchers and the automotive industry to design and test suitable devices.
Conservation Implications and Future Research
The potential benefits of this technology extend beyond simply reducing roadkill. By protecting hedgehogs from vehicle collisions, conservationists hope to bolster the species’ overall population and prevent further declines. The European hedgehog plays an important role in its ecosystem as an insectivore, helping to control pest populations.
Further research will focus on refining the ultrasound frequencies and intensities used in the repellents to maximize their effectiveness while minimizing any potential disturbance to other wildlife. Researchers will also need to assess the long-term impact of these devices on hedgehog behavior and movement patterns.
The development of ultrasound repellents represents an innovative approach to wildlife conservation, leveraging technological advancements to address a pressing environmental challenge. The next steps involve securing funding and partnerships to translate these research findings into a tangible solution for protecting these beloved creatures.
What are your thoughts on using technology to protect wildlife? Share your comments below, and please share this article with others who are interested in hedgehog conservation.
