Four beaver territories along the River Otter in Devon collectively hold more than 24 million liters of water and reduce flood peaks by an average of 30 percent, according to recent research. This data was measured in a country that had no beavers for almost 400 years. In summer 2024, they returned. Simultaneously in four regions across Britain, wild-born kits were documented for the first time since the 16th century. By 2026, the government plans to release around 100 additional beavers.
Four Centuries Without Beavers
Beavers lived in the UK until the late 16th century. They were then systematically hunted for fur, for castoreum (a gland secretion traded as medicine), and because settlers drained the wetlands that beavers created. By 1600, they were considered extinct on the islands.
The foundation for European recolonization was laid by a small remnant population on the Elbe River. In the 19th century, around 200 Eurasian beavers survived in Saxony, Saxony-Anhalt, and Brandenburg as the last remaining animals in Central Europe. From there, reintroduction programs began in Bavaria and Brandenburg from the 1960s onward. Today, Germany is home to roughly 35,000 beavers according to current estimates.
Scotland's return began earlier than England. Starting in 2009, the first official UK reintroduction project ran at Knapdale Forest. A wild-established population on the River Tay, likely from escaped captive animals, received legal protection in 2019. England followed suit. Beginning in 2015, a trial ran on the River Otter in Devon under the leadership of the Devon Wildlife Trust, which became a regular license in 2020.
From Two Pairs to 61 Animals: Six Projects Running Simultaneously
In December 2023, the Cairngorms National Park Authority released the first beavers on the upper Spey. Since then, park management has conducted monthly population counts. The result: from the initial two pairs, 61 animals have been documented by May 2026. In 2025 alone, 18 kits from eight different families were born in the wild, and one so far in 2026.
Simultaneously, three English projects also reported wild-born beavers in 2024: the National Trust's Purbeck project in Dorset, the Shropshire Wildlife Trust, and an urban conservation project in London's Enfield borough. That four regions documented wild births in a single year is seen by conservation organizations as evidence that the species has become established in British habitats.
Natural England approved two new licensed release projects in southwest England in February 2026. Nine additional sites were invited to submit applications, including proposals in Devon, Cornwall, Dorset, Kent, Isle of Wight, and Cumbria. Feasibility studies are underway for larger river systems like the Humber, Severn, and Thames.
What Beavers Deliver to Ecosystems: Wetlands, Flood Buffering, Biodiversity
The River Otter in Devon provides the most systematic data to date. Ten years after the first evidence of wild beavers, the population comprises around 20 family territories. The Devon Wildlife Trust has documented the ecological effects in a long-term study: four beaver territories collectively store more than 24 million liters of water. During heavy rain, dam structures created by beavers reduced runoff by an average of 30 percent according to analysis of environmental agency data.
In newly created wetlands along the River Otter, otters, kingfishers, frogs, dragonflies, and damselflies were recorded more frequently. The beavers themselves do not eat fish, but the structure of their dams creates calm shallow-water zones used as spawning grounds. Trout densities increased measurably in colonized sections.
In Comparison: Germany and the River Otter Show What Is Possible
Germany is Europe's flagship project. From roughly 200 Elbe survivors in the 19th century, sixty years of reintroduction produced around 35,000 beavers. The population continues to grow and has spread as far west as western Germany. Conflicts with agriculture are documented: beaver dams can impair drainage systems and flood fields. Despite these tensions, Germany stands as proof that beavers and human land use can coexist long-term.
The River Otter illustrates what is possible in a manageable timeframe. When a wild pair was discovered in Devon in 2014, it was the first documented case of wild beavers in England in centuries. Ten years later, the population comprises around 20 family territories, with measurable effects on water balance and biodiversity in a single river system.
Dams and Fields: The Open Conflict Line
For its 2026 expansion program, Natural England introduced the Beaver Considerations Assessment Toolkit (BCAT), an online tool that went live on February 2, 2026. It shows for each potential habitat where beavers are likely to build dams and how that might affect farming, drainage systems, and infrastructure. Project operators are required to mediate conflicts with landowners.
Britain starts with better planning tools than Germany had in the 1960s. The first test case is emerging: when Natural England completes feasibility studies for the Humber, Severn, and Thames and issues the first licenses there, beavers will encounter some of Europe's most densely populated and intensively farmed river systems. How that negotiation unfolds will largely determine how large Britain's beaver population is in twenty years.