At the Ham Fen nature reserve in south-east England, an event has taken place that can be called a symbol of nature returning to its natural course: after more than twenty years of protection, the fence restricting the beavers' movement has been removed. The animals, first brought here in 2003, can now freely explore the surrounding landscape and fulfil their role as "ecosystem engineers".
The Ham Fen project became the first official reintroduction of the Eurasian beaver (Castor fiber) to the United Kingdom after the species' disappearance in the sixteenth century. The reserve — the last remaining stretch of fenland in the county of Kent — began to dry out by the early 2000s, threatening its stores of peat and carbon. The beavers, released under controlled conditions, quickly changed the situation: they built dams, raised the water level and created a mosaic of open water, marshes and thickets.
The decision to remove the barrier followed a change in government policy in February 2025, when the authorities in England permitted licensed releases of beavers into the wild. Now the animals from Ham Fen will be able to build dams and canals beyond the reserve, helping to retain water, improve soil quality and create new habitats for other species.
Over two decades of observation, it became clear just how effectively beavers restore wetland ecosystems. The rise in the groundwater level helped preserve the peat bogs, while the natural "trimming" of trees opened up space for light and a diversity of vegetation. Similar changes have already been noted in other regions of England, where beavers influence hydrology and support biodiversity.
The project's success shows how targeted protection and the subsequent easing of controls allow a species to take its place in the landscape. Beavers are not merely returning — they are actively shaping conditions that benefit humans too: better water retention, a reduced risk of droughts and floods, and new opportunities for wildlife watching.
When beavers are given the opportunity to move freely, nature itself begins to restore the balance that humans once disrupted.
