How did beavers stop the flooding at a London Underground tube station?
Wildlife conservationist Elliot Newton and veterinarian Sean McCormick relocated beavers into a 20-acre park adjacent to the tube station — a former golf course with a creek running through it. Within weeks of their arrival, the beavers built a dam that created a pond, turning the entire area into a sponge that soaks up excess water, effectively stopping the flooding that had plagued the station's ticket office for years.
The tube station had lined its entrance with sandbags for years, unable to prevent the ticket office floor from filling with water every time it rained heavily. Traditional flood mitigation engineering was estimated to cost hundreds of thousands — potentially over one million pounds. The beaver-led solution at the Ealing Beaver Project in West London delivered the same outcome at a fraction of that cost, and did so within weeks rather than years. The beavers needed no instruction: dam-building and water management are precisely what they are biologically wired to do.
The ecological ripple effects have gone well beyond flood control. Since the beavers arrived at the site, researchers have recorded 8 new bird species and 2 new bat species in the area, with the bat count alone rising from 4 to 6 species. What was once a flat, unremarkable former golf course is now a functioning wetland — the kind of habitat Britain had not seen for centuries. You can follow NPR's full investigation into how beavers are being used as a climate adaptation tool across Britain on Listenly's Up First page.
"The beavers can do it, probably a fraction of the cost, probably better than we can, certainly more sustainably for the environment."
— Lauren Frayer, NPR ReporterAbout Lauren Frayer
Lauren Frayer is an NPR reporter who traveled extensively across Britain to report on the country's large-scale beaver reintroduction program — visiting four distinct beaver sites to build this investigation. Her fieldwork included a hike with forest rangers beginning at 4 a.m. through Napdale Forest in western Scotland, one of the earliest and most remote sites of the reintroduction effort, as well as an on-the-ground visit to the Ealing Beaver Project in West London, where she observed the dam that resolved the tube station flooding. For this story, Frayer interviewed an unusually wide range of sources — scientists, veterinarians, wildlife conservationists, and farmers — giving her reporting a 360-degree view of both the promise and the tensions surrounding beaver reintroduction. Her direct encounter with the beavers' dam-building at the Ealing site, guided by conservationist Elliot Newton, placed her at the physical center of the story, allowing her to describe in concrete, observed detail what the beavers built and why it works.
See also
Millie and Bjornar were two Norwegian beavers relocated by wildlife officials in 2009 to Napdale Forest, a temperate rainforest in western Scotland, as part of Britain's beaver reintroduction program.
In 1992, when Britain was still part of the European Union, the EU passed a law requiring member states to investigate which species had gone extinct as a result of human activity and explore their reintroduction.
Beavers were hunted to extinction in Britain by the early 20th century. Humans wanted their waterproof fur, their meat, and their anal secretions — a substance prized for various uses — leaving only around 1,200 beavers alive across Europe and northern Asia.