Six Eurasian beavers have been released into the wild in Somerset earlier this week under a new government licensing system that came into effect last year. The very same day, four more beavers were released by the Cornwall Wildlife Trust in the Par and Fowey river catchment.

Reintroducing wild keystone species to parts of the UK has often been a drawn out, bureaucratic or politically charged process, so this wave of beaver releases is being hailed by many as a big step forward in proactive conservation.

Why Are Beavers Important?

Beavers are often described as ‘ecosystem engineers’. Their dam-building and tree-felling activities completely reshape freshwater environments, creating ponds and wetland habitats that can host a wide range of fish, bird, amphibian, mammal and insect species. A 2016 study found that gamma diversity, a metric used to quantify total species richness across a landscape, was 28% higher in beaver-modified stream habitats compared to unmodified habitats.

Beaver dams also act as natural flood defences, retaining large amounts of water following heavy rainfall. A landmark trial on the River Otter in Devon revealed that beavers can reduce flood flows by up to 60% by slowing the rate at which stormwater can flow through the river catchment.

Beaver-shaped wetlands also lessen the impact of droughts by slowly releasing water into surrounding soils during periods of below average rainfall. This can be of great benefit to agricultural land situated near beaver-occupied streams and rivers. This effect is likely to become increasingly important as seasonal rainfall patterns across the UK face significant changes in response to climate change.

A Return to the UK

The presence of beavers was once widespread across much of the UK, but the species was hunted to extinction by the 1500s, primarily for their fur, meat and castoreum, a glandular secretion historically used in perfume and medicine.

Over the last two decades, reintroduction efforts have started to gain momentum. In Scotland, beavers were first reintroduced in 2009 and became a legally protected species in 2019. Today, wild populations in Scotland continue to expand, with some estimates exceeding 2000 beavers across multiple river systems.

Beavers were only allowed to be released into enclosures in England until the new government licensing regulations were introduced in February 2025. There are 39 current applications for wild beaver release licenses - 20 of these were submitted by the Wildlife Trusts, who hope to release about 100 beavers by the end of 2026.

2026 has delivered good news for Welsh beavers; the Welsh Government announced earlier this month that the species would gain European Protected Species status, making it illegal to harm beavers deliberately or to damage their habitats.

Beaver Backlash

Some farmers, foresters and landowners have vocalised concerns about beaver reintroduction. The initial construction of dams by newly introduced beavers can cause streams and their surrounding wetlands to encroach onto arable land, destroying crops or destabilising soils. Though consultation events with local stakeholders are mandatory in the release licence application process, unpredictable and damaging impacts can often be overlooked.

The Scottish government has begun to address this issue by trapping beavers in areas where they have begun to damage adjacent land, before relocating them to other streams and rivers where new release licenses have been granted. In 2023, for instance, a small population of beavers were relocated from the River Tay, where wetland expansion had begun to damage farmland, to three different sites in the Cairngorms where NatureScot had recently approved new release licenses.

What’s Next

As wild beaver populations across the UK slowly expand, so does the knowledge of how this special species interacts with the different landscapes it occupies. With each new release, conservationists gain valuable information about beaver behaviour and can better understand where to look for suitable future release sites that maximise ecological benefits without negatively impacting local stakeholders.