Beavers Rewild London: Natural Flood Defense in Easing

In October 2023, five Eurasian beavers were released into Paradise Fields, a 10-hectare urban wetland in Ealing. Within a year they built at least five dams, and Greenford tube station recorded no flood-related closures in 2024 and 2025, ending a decade of inundation.

How Eight Beavers Solved a London Tube Flooding Crisis

Beavers (Castor fiber) vanished from the United Kingdom about 400 years ago after intensive hunting for fur and castoreum. Climate-driven storms have heightened flash-flood risk in London, prompting councils to explore low-cost, nature-based alternatives to concrete drainage.

Beavers Return to London After 400 Years, Solving Decades-Old Urban Flooding Crisis

Veterinarian Sean McCormack led the release, working with urban beaver officer Seniz Mustafa, Ealing Council, and Natural England, which granted the licence. Academic advisors Emily Fairfax (University of Minnesota) and George Holmes (University of Leeds) provided scientific input.

CNN

The five original beavers have grown to at least eight, including matriarch Willow (?30 kg) and her kits. Their dams created a wetland sponge that eliminated downstream flood peaks and attracted fish, amphibians, insects, birds and bats.

How Eight Beavers Solved a London Tube Flooding Crisis

Ealing Council said the project proves that “working with nature can improve our resilience to climate change.” Mayor Sadiq Khan’s office called the beavers “an important part of supporting local habitats.” Seniz Mustafa highlighted the dams’ role in slowing water flow, and Sean McCormack called the outcome “demonstrating that living alongside beavers is not a wild idea.”

The Independent

University of Leeds professor George Holmes warned that beavers can be imposed on farmers and landowners, describing “beaver bombing” as a risk of unlicensed releases that may damage infrastructure and alter water levels.

CNN

Sources differ on the exact number of kits born to Willow; some report two litters in 2024 and 2025 without a precise count, while others say the total will be known only after the young emerge from their lodge.

CBC News

• “Why don’t we try a nature-based solution?” — Sean McCormack, Project Leader, Ealing Beaver Project

CNN

• “The Ealing Beaver Project There’s a joke in the beaver science community “that if you’ve got a problem, there’s a beaver for that,” Fairfax said.” — Emily Fairfax, Assistant Professor of Geography, University of Minnesota

CNN

• “There are a lot of people out there promising that beavers will do all these marvelous things, but I think they are making promises they can’t keep.” — George Holmes, Conservation Professor, University of Leeds

CNN

Ealing Council will monitor the colony through 2026 and aims to replicate the approach in Croydon by 2028. The mayor’s rewilding fund continues to back urban habitat projects, while Natural England reviews licensing to balance ecological benefits with agricultural concerns.

Beavers Return to London After 400 Years, Solving Decades-Old Urban Flooding Crisis