After centuries of absence, evidence of the European beaver (Castor fibre) in Portuguese territory has finally been confirmed, following monitoring by Rewilding Portugal in a border area with Spain. The natural dispersal of this ecosystem engineer into Portugal marks not only the return of a species that was once locally extinct, but also a significant step forward for the aquatic restoration of the country’s river systems.
The last known record of beavers in Portugal dates back to the late 15th century. Since then, the species disappeared as a result of intensive hunting and widespread habitat loss. Over the past two decades, beaver populations have steadily recovered in Spain. More recently, signs of their proximity to the Portuguese border were documented by Rewilding Portugal through field monitoring. Typical activity such as gnawed trees and small watercourse structures began to appear, and the use of camera traps eventually confirmed the presence of a young adult beaver within Portuguese territory.
In 2023, Expresso newspaper reported that the beaver was about 150 metres from the Portuguese border, with consistent records in the Arribes del Duero Natural Park, near the border with Portugal.
“We’ve been on the lookout for this breakthrough for a few years now, and now we’re thrilled to confirm its return. The beaver is a natural ally in restoring the health of our rivers and wetlands and has a fundamental role to play in our river ecosystems,” says Pedro Prata, Team Leader at Rewilding Portugal.
Rewilding Portugal leads the Greater Côa Valley project, where work supported by the Endangered Landscapes & Seascapes Programme is focused on restoring natural processes, reconnecting habitats and enabling wildlife comeback in one of Portugal’s most ecologically important regions.
How beavers support river restoration
Beavers are widely recognised as ecosystem engineers. Through instinctive behaviours like dam building, channel digging and modifying riverbanks, they reshape the landscape in ways that enhance water retention, habitat diversity and overall ecological health. These changes have well-documented benefits for biodiversity and help increase the resilience of riparian ecosystems.
By building dams, beavers create wetlands, marshes and pools of standing water that provide habitat for a wide range of species, including amphibians, aquatic insects, water birds, fish and small mammals. These new habitats enrich biodiversity in and around watercourses. Beaver-created wetlands also act as natural filters, trapping sediment and pollutants while slowing surface runoff, which helps reduce erosion and the risk of flooding.
“We’re talking about a species that provides ecological services no modern equipment can match in efficiency or scale. The beaver improves water quality, creates refuges for other species and helps us respond to challenges like drought and fire,” says Pedro Prata.
By raising water levels along riverbanks, beavers also increase the amount of water stored in the soil. This is particularly important in areas affected by prolonged drought and desertification, which are becoming more common across rural Portugal. Their dams help retain water in the landscape and release it gradually throughout the year.
There is also growing evidence that the wetlands created by beavers act as natural firebreaks. By maintaining permanently damp zones, they slow the spread of wildfires and provide shelter for wildlife during critical periods.
A key species for rewilding
Rewilding is increasingly recognised as a practical and systemic approach to restoring ecosystems, centred on the return of key species and the recovery of natural processes. By allowing nature the space and time to function with minimal human intervention, this approach helps revive degraded landscapes and build ecological resilience.
The beaver is one of the clearest examples of rewilding in action in Europe. Its natural return offers a significant ecological boost to many Portuguese rivers, which have been heavily modified, channelled and are often in poor ecological condition.
Rewilding Portugal argues that the beaver’s return should be more than accepted, it should be welcomed as a catalyst for ecological recovery. This is a clear opportunity to apply rewilding principles on the ground: restoring natural dynamics, supporting biodiversity and creating healthier, more resilient landscapes.
“The return of the beaver to Portugal is a symbol of hope and change. It shows that if we give nature space and time, it will respond. It’s now up to us to ensure that this return is well received and protected,” says Pedro Prata.
Coexistence will play a fundamental role
The return of the beaver also brings challenges. Its presence can sometimes affect riverside plantations or infrastructure that is not adapted to the natural dynamics of rivers. However, examples from across Europe show that coexistence is both possible and beneficial, using straightforward and effective mitigation measures. Information sharing, dialogue with local communities and technical support are all key to ensuring this return is welcomed rather than seen as a problem.
In Sweden, where beavers were reintroduced in the last century, financial compensation programmes were created for farmers and forest owners affected by dam-related flooding. In Germany, trained Beaver Managers mediate between human activity and beaver presence, using water level control devices such as pipes in dykes to regulate water height without destroying dams. They also promote natural engineering solutions, including protective barriers around fields and trees. These approaches have also been adopted in Switzerland. In France, awareness campaigns and illustrated guides have helped highlight the ecological benefits of beavers and how to address any conflicts.
In light of these examples, Rewilding Portugal chose to make the discovery public and notified the relevant authorities early on. They called for proactive planning to anticipate potential issues, engage local communities, and support the beaver’s return in a way that fosters coexistence. Rewilding Portugal remains ready to contribute to this process.
This topic will be a major focus of the second national rewilding congress, taking place in the Douro region in October or November. The event will bring together stakeholders to explore how Portugal can support the return of the beaver through early planning, dialogue and cooperation.
The arrival of the beaver in Portugal is a symbolic moment for nature conservation. At a time of climate crisis and biodiversity decline, it offers a sign of resilience and recovery. But it is also a call to action: to protect riparian habitats, reconnect ecological corridors and support the return of species that have long been missing from these ecosystems.
Portugal now has a chance to write a new chapter in its relationship with nature. The beaver has taken the first step. It is up to us to follow through.
This article was originally published on the Rewilding Portugal website. To find out more about the Greater Côa Valley, visit their project page.
