Scientists discover hedgehogs can hear high-frequency sounds, opening door to roadside deterrent systems as vehicle strikes kill one in three of the declining mammals.
Scientists have discovered that hedgehogs can hear high-frequency ultrasound, potentially enabling the development of roadside deterrent systems to prevent fatal vehicle collisions. The research offers new hope for protecting the declining mammal population across Europe. Vehicle strikes currently kill an estimated one in three hedgehogs, representing a major threat to the species.
Hedgehog populations have declined drastically across Europe in recent decades, with road mortality identified as a significant contributing factor. The mammals' nocturnal foraging behavior often brings them into contact with vehicles on roads that fragment their habitat. Conservation efforts have struggled to address this mounting pressure on already vulnerable populations.
The study demonstrates that hedgehogs possess the auditory capability to detect very high frequencies beyond human hearing range. This discovery provides the scientific foundation needed to engineer ultrasound-based repeller devices specifically calibrated to hedgehog hearing. Such systems could be strategically deployed along roadways in hedgehog habitats to warn animals away from approaching traffic.
If proven effective in field trials, ultrasound repellers could be integrated into existing wildlife crossing infrastructure or installed as standalone roadside units. The technology would need to balance effectiveness in deterring hedgehogs while avoiding negative impacts on other wildlife species that also rely on ultrasonic communication.