Oxford study finds hedgehogs hear ultrasound up to 85 kHz

Scientists at the University of Oxford and collaborators in Denmark report that European hedgehogs can hear ultrasonic frequencies up to at least 85 kHz, a range far beyond human hearing and higher than previously documented for the species. In the Biology Letters study, the team used auditory brainstem response testing in 20 rehabilitated hedgehogs from Danish wildlife rescue centers and paired those findings with micro-CT imaging of hedgehog ear anatomy, which showed structural features that may help transmit very high-frequency sound. Oxford researchers say the discovery could support development of ultrasonic deterrent devices aimed at keeping hedgehogs away from roads, cars, lawnmowers, and other hazards. (ox.ac.uk)

Why it matters: For veterinary professionals, especially those in wildlife rehabilitation, exotic animal medicine, and conservation practice, the finding adds a clinically relevant layer to how hedgehogs may perceive their environment. It could eventually inform handling, housing, acoustic stress reduction, and rehabilitation release planning, while also opening the door to noninvasive injury-prevention strategies for a species already pressured by road mortality and habitat fragmentation. Researchers and outside observers caution, though, that hearing capability alone doesn’t prove an ultrasonic repellent will work in awake, free-ranging animals. (biology.ox.ac.uk)

What to watch: The next step is whether researchers can partner with industry to test practical ultrasonic deterrents and show that hedgehogs actually change behavior around vehicles or equipment in real-world settings. (ox.ac.uk)