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New study suggests ultrasound could help save hedgehogs
Dr Rasmussen added: “Our novel results revealed that European hedgehogs are designed to, and can, perceive a broad ultrasonic range. A fascinating question now is whether they use ultrasound to communicate with each other, or to detect prey – something we have already begun investigating.”
Lead researcher Assistant Professor Sophie Lund Rasmussen, Wildlife Conservation Research Unit and Department of Biology.
The European hedgehog (Erinaceus europaeus) is one of our best-loved mammals, but populations are in grave decline with the species being newly classed as “near threatened” by the International Union for Conservation of Nature in 2024. A major cause of hedgehog deaths is road traffic accidents, which are thought to kill up to one in three hedgehogs in local populations.
A new study now suggests that ultrasound repellers could be used to deter hedgehogs from roads, reducing the number killed by cars. Up to now, it was unknown whether hedgehogs could hear this range.
Lead researcher Assistant Professor Sophie Lund Rasmussen (Wildlife Conservation Research Unit/Department of Biology, University of Oxford and University of Copenhagen) said: ‘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. 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.’
Dr Sophie Lund Rasmussen. Credit: Joan Ostenfeldt.
In the study, researchers at the University of Oxford collaborated with colleagues in Denmark to test the auditory brainstem response of 20 rehabilitated hedgehogs from Danish wildlife rescue centres. This method uses small electrodes placed on the animals to record electrical signals travelling between the inner ear and the brain, while short bursts of sounds are played through a small loudspeaker.
The electrodes detected that the brainstem fired when signals were played across a range of 4-85 kHz, with a peak sensitivity around 40 kHz. This demonstrates that hedgehogs can hear in the ultrasound range (which starts at frequencies greater than 20 kHz), up to at least 85 kHz. After being checked by a veterinarian after the experiments, the hedgehogs were released back into the wild on the following night.
The team also carried out high-resolution micro-CT scans of a dead hedgehog (which had been euthanised after being critically injured by a rat trap). The scans were used to build an interactive 3D model of the hedgehog’s ear, revealing features never seen before. The model showed that hedgehogs have very small, dense middle-ear bones and a partly fused joint between the eardrum and the first of these bones. This makes the whole chain of bones stiffer, helping it pass very high-pitched sounds efficiently – a hallmark of animals, such as echolocating bats, that can hear ultrasound.
Infographic of the study’s findings. Credit: Public Affairs Directorate, University of Oxford, and Getty Images.
These scans also revealed that hedgehogs have a small stapes (the smallest middle-ear bone that connects the chain of ear bones to the inner ear’s fluid-filled cochlea). A smaller, lighter stapes can vibrate more quickly, enabling it to transmit high-frequency sound waves. The cochlea was also found to be relatively short and compact, enabling it to better process ultrasonic vibrations.
Model of hedgehog ear bones. Credit: Rasmussen et al 2026.
The results suggest that it would be possible to design ultrasonic repellents that can be heard by hedgehogs, but not humans or pets.* If proved effective, these could potentially be used to deter hedgehogs from roads and other potential threats, such as robotic lawnmowers and garden strimmers.
Co-author Professor David Macdonald (Wildlife Conservation Research Unit/Department of Biology, University of Oxford) said: ‘It is especially exciting when research motivated by conservation leads to a fundamental new discovery about a species biology which, full circle, in turn offers a new avenue for conservation. The critical question now is whether the hedgehogs respond to ultrasound in ways that might reduce the risks of collisions with robotic lawnmowers or even cars.’
The study was a collaboration between the University of Oxford, The Natural History Museum Denmark at University of Copenhagen, City Dyreklinik (Copenhagen), Aarhus University, Aarhus University Hospital, University of Southern Denmark.
The study ‘Hearing and anatomy of the ear of the European hedgehog Erinaceus europaeus’ has been published in Biology Letters.
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*Humans hear in the range of 20-20,000 Hz, dogs 67- 45,000 Hz, and cats 45-65,000 Hz.
On Wednesday, September 2, it was the Concours judging and private viewings to dominate the agenda for the day.
Twelve Concours classes were held across almost a century of motoring, including The Golden Age of Motoring, 100 Years of Carrrozzeria Touring, La Dolce Vita, 60 Years of the Lamborghini Miura and Passione Ferrari.
Two new classes also made their debut for 2026, Rare Breeds of the Digital Age and Hypercar Heaven, which recognise the growing importance of contemporary performance cars within the international collector market.
Judging will take place across Wednesday and Thursday, with the show field bringing together a 70-strong collection of classics, supercars and hypercars from around the world.
Some of the cars include Aa Maserati 8C 3000, Alfa Romeo Sprint Berlinetta, a one-off Maserati 3500GT Spyder Prototipo by Vignale, a very early Porsche 356 Split Window Coupé, Aston Martin DB3S, Lamborghini Miura P400S, Bizzarrini 5300GT, Ferrari 250 GT Series 1 Cabriolet, Bugatti EB110 Prototype, Aston Martin Valiant Prototype and the extraordinary Bugatti Bolide, one of just 40 produced worldwide.
Helen Pike has decided to step down as Master of Magdalen College School at the end of the 2026/27 academic year, the school in east Oxford announced in March.
MCS is one of the top performing schools in the country, ranking in the top 20 independent secondary schools in The Sunday Times Parent Power Schools Guide 2026.
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The new academic year will start next week, with Ms Pike preparing for one more year in charge before she hands over to her successor, who will take over in September 2027.
The first female Master at MCS, Ms Pike guided the board of governors to one of the most significant decisions in the school’s history, to become fully co-educational from 2027.
While there has been a co-educational sixth form at the school for 15 years, the school last month announced it will become fully co-educational over the coming decade.
Ms Pike said earlier: “I love MCS, and it is a perennial privilege to lead this remarkable school.
“Being Master of MCS is a brilliant job, and I am declaring my intention early in order to give MCS the very best opportunity to find the right Master for September 2027. I shall continue to do all in my power to further the fortunes of this wonderful school until then.
“I look forward to a new phase in my own professional life, one that builds on all that I have enjoyed and achieved in my career during the past 30 years.
“Having encouraged many cohorts of pupils to take sensible risks and to do something creative and different when the time feels right, I am doing just that.”
During Ms Pike’s tenure, MCS has been recognised as a Top 20 Independent School and South East School of the Year by the Sunday Times and won Independent School of the Year for Social Mobility.
Thanking her in his letter to the school community, chair of governors, Bob Price, said earlier this year: “Helen is an outstanding leader and will go with our sincere gratitude and warm thanks for her exceptional headship.
“She will leave the school in excellent shape for her successor.”
Recruitment for a replacement for Ms Pike is now under way.
Last month, Ms Pike congratulated pupils on their “outstanding success” in this year’s A-Level exams, after more than a quarter of pupils (43) achieved three A*s or more and 25 secured all A*s.
In total, 39 pupils from the 2026 cohort are heading to Oxbridge, while 22 have secured places to study medicine.
As part of the school’s expansion plans, MCS is preparing to build a new Science, Library and Partnerships building.
A spokeswoman said the new building will offer an exciting opportunity to reimagine the senior school site as staff look ahead to full co-education.
She added earlier: “With a vision to create a sector-leading science building in the centre of Oxford, the development will enable us to support an ambitious and forward-looking science curriculum, expanding to the emerging and rapidly advancing areas of robotics, AI and Big Data.”
Holding banners which read ‘For f**k’s sake, just stop oil’, the demonstrators took to the road in Parliament Square at noon today (Wednesday, September 2).
This was as Andy Burnham faced his first Prime Minister’s Questions, and many of the protestors glued themselves to the road.
The group demanded that the UK government stop approving all further oil and gas developments, and sign a Fossil Fuel Treaty to stop oil and gas extraction.
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Just Stop Oil say that the police are expected to arrest all those blocking the road, and that one lane has been left free of glued-on action takers to permit access for emergency vehicles.
Andy Burnham is due to make a decision on whether to allow more drilling for oil and gas in the North Sea.
Reverend James Crote, a Baptist Minister and grandfather from Chesterton near Bicester, said: “Today is my grandson’s first birthday. I have to take action for the sake of his future.
The 69-year-old added: “The government has been dilly-dallying about whether to say yes or no to the Rosebank oil field but, if we want a future for our children, there is no choice – it has to say ‘no’.
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“I am here as a Christian Minister because the Church has to speak out and demand that the government stops approving further oil and gas developments now. It’s time for us all to say ‘For God’s sake, Just Stop Oil’.”
Data from the Met Office indicates that 2026 was the hottest summer in UK recorded history, beating 2025, which was the previous hottest summer on record.
2026 was also one of the driest summers on record, delivering record-low food harvests.
Climbing temperatures have triggered wildfires across the country, and national fire chiefs said the wildfire risk facing the UK is “like nothing we have seen before”.
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Taking action, grandmother Victoria Ann Lynch-Staunton from Leamington Spa, said: “What is happening is beyond a tragedy.”
The 71-year-old added: “I beg everyone to join Just Stop Oil or governments will continue to prioritise endless growth and corporate profit over billions of lives – yours and your children.
“Wake up and smell the coffin. It is the responsibility of all of us to act now!”
A Just Stop Oil spokesperson said today: “We are all Just Stop Oil.
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“Every single person who fears deadly wildfires, devastating droughts, and spiralling food shortages is Just Stop Oil.
“The first duty of government is to keep the public safe – but by greenlighting oil and gas drilling, they endanger our survival while corporates and billionaires laugh their way to the bank.
“Every one of us feels alone and powerless in the face of this insanity, but we know there is massive political and public support for our demand.
“So we’re inviting everyone to join us at an online call on 3rd October 2026 – because it’s when we work together that we are powerful and win.”
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