Until two years ago, West London’s Greenford Tube station flooded when it rained heavily, with sandbags still lining the corridor. Train tracks rise aboveground, but the ticket office and adjoining areas still took on water during downpours—an illustration of how climate-driven rainfall changes can overwhelm places not built for them.
The arrival of a beaver family nearby altered that pattern. In October 2023, a family of five beavers was resettled on a 20-acre urban park near the station, after conservationists obtained a government license to move the animals to the site. NPR described the park as an area that previously served as a golf course, with a creek running through it.
Within weeks of the relocation, the beavers dammed up the creek, forming a pond that holds water and slows or prevents spillover into the city. They also redirected the creek’s flow into smaller tributaries, helping create a wetland landscape more able to absorb heavy rainfall and reduce flood risk downstream, according to NPR.
“They effectively turned this site into a giant sponge that can take heavy rainfall and slowly release water back into the landscape, creating a lot more resilience for flooding,” said Sean McCormack, a local veterinarian who started the Ealing Beaver Project. McCormack also described how the beavers’ wood-cutting opened up the canopy and supported biodiversity, saying the project has produced what he called an “abundance of biodiversity.”
NPR reported specific wildlife changes around the beaver-managed wetlands, including the appearance of freshwater shrimp in the creek and the return of multiple bird species as well as two types of bats. McCormack said rare brown hairstreak butterflies laid their eggs on blackthorn branches nibbled by beavers, reflecting how the animals’ habitat modifications can ripple through local ecosystems.
The beavers have also affected the way local flooding infrastructure is planned. McCormack said the project helped the city scrap expensive plans to dig a reservoir and levee, adding that “We said the beavers can do it for a fraction of the cost, certainly more sustainably.”
Beyond engineering, the beavers have become a local attraction: joggers and teenagers stop to watch, and the park offers guided walks and “beaver safaris.” NPR described a recent spring evening when a reddish-brown adult beaver moved in and out of the water and chomped on a felled willow tree, weighing in at a size NPR compared to a “fat golden retriever.”
While London’s effort is concentrated in an enclosed urban park, Scotland’s experience shows the tradeoffs of bringing the species back to landscapes where it can spread onto private land. Humans hunted beavers to extinction in Britain more than 400 years ago, NPR said, and by the early 20th century only about 1,200 native beavers remained in parts of Europe and northern Asia. Sweden reintroduced beavers in the 1920s, and later countries followed, including Britain, where genetic research led officials to use Norwegian beavers.
In 2009, wildlife officials relocated two Norwegian beavers to Knapdale Forest in western Scotland. NPR said the pair—Millie and Bjornar—became the “Adam and Eve of the modern-day British beaver population,” and it noted that a forestry department described them as the “original beaver power couple.” Pete Creech, a forest ranger who remembers their arrival, recalled their behavior and said he set up hidden cameras to capture their dawn-and-dusk routines as they dammed up a tiny river and created a lagoon where swans nest.
That model of reintroduced habitat has come with conflict. NPR reported that as beaver populations expanded in Scotland—sometimes boosted by “beaver bombers,” or people who released unlicensed beavers—farmers in some areas became concerned. Kate Maitland, a regional representative for Scotland’s National Farmers Union, said the presence of beavers can harm crops by flooding irrigation channels and can lead to erosion when trees are felled and riverbanks collapse, describing damages she said can include acres of land underwater.
The Scottish government has set up a fund to rebuild riverbanks and other damage if repairs serve the public interest, NPR said, but it typically does not cover damage to private land. Farmers can shoot beavers only with a license because the animals are protected, NPR reported, and it is also illegal to disassemble dams or lodges more than two weeks old; officials may trap and relocate beavers instead.
Not all landowners view beavers as a problem. NPR cited Tom Bowser, a fifth-generation farmer in central Scotland, who said that a “fat semiaquatic rodent who wants to raise water levels” is understandably unpopular when trying to grow food. Bowser also said he has found benefits outweigh the costs, including a beaver-created pond near his driveway that draws tourists and supports beaver-watching tours for children, which he said have turned beavers from fairy-tale figures into a living local feature.
NPR said the “beaver buzz” is spreading in other countries as well, including to Italy, Portugal, and parts of the Ukrainian Danube River delta, and it cited projects in the United States such as the Methow Beaver Project and NASA’s beaver-tracking work in Idaho. In Britain, the approach is finding interest among land managers who say they lack staff, including in South Norwood Country Park, a 125-acre nature reserve on London’s urban periphery.
Ian Glover, a countryside warden there, told NPR that he applied for a license and hoped to welcome beavers in 2028 or 2029. He said the park has just one employee and relies on volunteers, including waders who dredge streams once a year, and he described beavers as doing “exactly the sort of work” wetlands restoration would require—while noting that local predators such as wolves and bears have been extinct in Britain for centuries.
The beaver revival in Britain, NPR’s report suggested, now sits at the intersection of biodiversity recovery and climate adaptation—an experiment that depends on persuading communities to share land with animals that build wetlands by design.