The Naming of The Shrew! Greater white-toothed shrew spotted in Sunderland is deemed the first new mammal species in Britain since the 1920s

  • A picture of an animal caught by a cat in Sunderland was posted on Facebook
  • Ecologists have confirmed that the animal is a Greater white-toothed shrew
  • They have never been seen on mainland Britain before 
  • Experts worry that it will wipe out populations of the UK’s Pygmy Shrews

A Facebook picture of an unusual-looking animal caught by a cat has led to the discovery of the first non-native mammal to become established in the UK since the 1920s.

The Greater White-Toothed Shrew – which is described as looking similar to a character in children’s TV show The Clangers – has never before been found before on mainland Britain.

Ecologists are worried that the animal will wipe out populations of the UK’s Pygmy Shrews, as happened in Ireland, where they first appeared in 2007.

A Facebook picture of an unusual-looking animal caught by a cat has led to the discovery of the first non-native mammal to become established in the UK since the 1920s

The Greater White-Toothed Shrew 

Greater White-Toothed Shrews on the continent are known as House Shrews as they are often found in homes and farm buildings.

In Ireland the shrews are spreading at around 3.1 miles a year, an astonishing distance for a small mammal.

Wherever it has spread in Ireland it appears to have led to the complete disappearance of the Pygmy Shrew, but it is unclear whether this will happen in the UK which has a ‘more complex’ ecosystem.

The shrews measure 2.3 – 3.5 inches long, and weigh 4.5 – 14.5g.

They eat woodlice, snails, slugs, spiders, caterpillars and earthworms.

Shrews give birth to litters of between two and 11 young, known as shrewlets.

The animals can be aggressive towards strangers if scared, while their predators are barn owls, stoats and domestic cats.

The shrews are thought to have originated in Morocco, but crossed the straits of Gibraltar around 60,000 years ago, and have been spreading further north, through Spain to France ever since.

The world became alerted to the discovery after Melissa Young, a digital marketing executive in Sunderland, posted pictures of the new shrew, which had been caught by her cat in the garage.

The pictures were spotted by ecologist, Ian Bond.

Now, tests carried out by experts from the British Mammal Society confirm that it is a Greater White-Toothed Shrew, which is found in western continental Europe, on Guernsey, Alderney and Herm, and a small part of north Africa.

The Sunderland population of the shrew would be the most northerly anywhere in the world.

But the animal’s arrival could spell bad news for native shrews in the UK and is a ‘worrying development’ according to ecologists.

It would be the first non-native mammal to become established in the UK since the American Mink in the 1920s.

In Ireland, where the shrew is also non-native, it outcompetes existing shrew populations.

The Greater White-Toothed Shrew has become established in Ireland, and wherever it has been found has wiped out colonies of pygmy shrews, a species also found in the UK.

Mr Bond said that the picture he saw on Facebook caught his eye.

He said: ‘White-toothed Shrews look fairly distinctive with a head more closely resembling Finger Mouse or the Clangers than a normal shrew.

‘The problem with that identification was that they have never occurred on the British mainland before!’

Melissa kept the suspected shrew in her freezer so further tests could be undertaken.

A subsequent DNA test, undertaken by Ecotype Genetics and Swift Ecology Ltd, confirmed it to be the Greater White Toothed Shrew. 

The Mammal Society’s Allan McDevitt said: ‘Given the rapid spread of the greater white-toothed shrew in Ireland, it is no surprise that it has eventually found its way to mainland Great Britain.

‘This is a worrying development however as this invasive shrew is clearly associated with the local disappearance of the native pygmy shrew in Ireland. 

‘It is known to outcompete other species of shrews on other islands, so it is urgent that its distribution and potential impacts on other shrew species is quickly assessed.’

How the shrew got to Britain is unknown.

Melissa’s cats appear to have been catching White-toothed Shrews since at least 2015.

The British Mammal Society said that, given there have been pictures of the shrews dating back seven years, the species could be quite widespread already without anyone having noticed.

Melissa said: ‘I’ve always kept my cats indoors to reduce their impact on wildlife, so I was really surprised when they regularly started catching shrews.

‘Thankfully, most were able to escape without injury, but the opportunity to study those that didn’t make it has led to this invaluable discovery!

‘The wildlife on your doorstep is simply amazing and I’m thankful to Ian for his observations and guidance which led to us taking a closer look at something most people wouldn’t look at twice.’

The British Mammal Society said they would like the public to submit any unusual shrew sightings on their Mammal Mapper app, or on another wildlife spotting app, iRecord.

Gavin Measures, Invasive Non-Native Species lead at Natural England said: ‘Melissa finding the Great White Toothed Shrew is a fantastic example of how important it is to be vigilant for invasive species in our gardens, parks and green spaces. 

‘This non-native shrew has had a negative effect on the Irish ecosystem. Evidence of this species in the United Kingdom now requires further investigation to establish how widespread it is, and any possible impact on our small mammal community.’


Nature is in more trouble now than at any time in human history with extinction looming over one million species of plants and animals, experts say.

That’s the key finding of the United Nations’ (UN) first comprehensive report on biodiversity – the variety of plant and animal life in the world or in a particular habitat.

The report – published on May 6, 2019 – says species are being lost at a rate tens or hundreds of times faster than in the past. 

Many of the worst effects can be prevented by changing the way we grow food, produce energy, deal with climate change and dispose of waste, the report said.

The report’s 39-page summary highlighted five ways people are reducing biodiversity:

– Turning forests, grasslands and other areas into farms, cities and other developments. The habitat loss leaves plants and animals homeless. About three-quarters of Earth’s land, two-thirds of its oceans and 85% of crucial wetlands have been severely altered or lost, making it harder for species to survive, the report said.

– Overfishing the world’s oceans. A third of the world’s fish stocks are overfished.

– Permitting climate change from the burning of fossil fuels to make it too hot, wet or dry for some species to survive. Almost half of the world’s land mammals – not including bats – and nearly a quarter of the birds have already had their habitats hit hard by global warming.

– Polluting land and water. Every year, 300 to 400 million tons of heavy metals, solvents and toxic sludge are dumped into the world’s waters.

– Allowing invasive species to crowd out native plants and animals. The number of invasive alien species per country has risen 70 per cent since 1970, with one species of bacteria threatening nearly 400 amphibian species.

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