A small herd of European wood bison has arrived in Portugal’s Greater Côa Valley — the first time these animals have roamed the country since the end of the last Ice Age. The translocation, managed by Rewilding Portugal in partnership with Rewilding Europe, marks a milestone in one of the most ambitious land restoration efforts on the continent, covering a quarter-million acres of protected wilderness.
At a glance
- European bison: The arriving animals were sourced from forests in northern Poland, where more than 4,000 bison now live wild after the species was brought back from the brink of extinction in the 20th century.
- Greater Côa Valley: Portugal’s government has set aside approximately 100,000 hectares of scrub, Mediterranean dry forest, and steep gorges for conservation — an area made available largely through the gradual abandonment of farmland.
- Rewilding Portugal: The team is treating this arrival as a pilot program, with close monitoring of how the bison acclimatize to the local landscape and climate, and staff training in bison management underway.
Why bison matter for this landscape
Bison are not passive residents. Through grazing, foraging, trampling, and fertilizing, they actively reshape the land around them — creating what ecologists call mosaic landscapes, a patchwork of grassland, scrub, and forest that supports far greater biodiversity than any single habitat type alone.
Studies from across Europe and North America have documented this effect with both European and American bison. The animals open up dense vegetation, spread seeds, disturb soil in ways that allow new plants to take hold, and deposit nutrients that enrich ecosystems downstream from where they roam. Research has also shown that these interactions can enhance carbon capture in both vegetation and soil — an increasingly important benefit as countries search for nature-based climate solutions.
In Portugal specifically, rewilders believe bison can play a direct role in reducing the risk of catastrophic wildfires, which have devastated the country in recent decades. By keeping vegetation from becoming uniformly dense and dry, large grazers help interrupt the conditions that allow fires to spread unchecked.
A landscape already coming back to life
The Greater Côa Valley wasn’t an empty slate when the bison arrived. The valley already shelters a small pack of Iberian wolves, roe deer, red deer, wild boar, and eagles. An ancient cattle breed — left to roam semi-wild as a stand-in for the extinct aurochs that once defined European ecosystems — has been present for years.
The valley also contains some of the most significant Paleolithic rock art in the world, carved into the schist cliffs along the Côa River tens of thousands of years ago. The same landscape that once hosted steppe bison — a predecessor of today’s European wood bison — is now receiving their distant relatives once again.
“We are viewing this translocation as a pilot,” explained Rewilding Portugal team leader Pedro Prata. “The bison will be closely monitored to see how they acclimatize to the local landscape and climate. This is the first time that Rewilding Portugal team has managed bison, so it’s a learning process for us too.”
A species that nearly vanished — and came back
The European bison, or wisent, was declared extinct in the wild in 1927. The last wild populations had been hunted to zero. What survived were roughly 50 animals held in captivity across European zoos. From that narrow genetic base, conservationists built back a wild population — one of the most documented large-mammal recoveries in history.
Today, more than 7,000 European bison live across the continent, from Poland and Romania to Germany and the U.K. Their recovery has been cited as a model for what sustained, cross-border conservation cooperation can achieve.
Portugal’s bison do face a genuine challenge: European bison have no documented history on the Iberian Peninsula. While steppe bison were present here roughly 10,000 B.C.E., their modern relatives evolved in and around central and eastern European forests. Studies of translocated bison in Spain have shown encouraging signs that the animals can adapt to hotter, drier climates — but Portugal’s program will add to that evidence base in real time.
Rewilding as a continental movement
Portugal’s bison arrival is part of a broader shift in how European nations think about land that has been depopulated or taken out of agricultural production. Rather than treating abandonment as a loss, rewilding advocates see it as an opening — a chance to let ecological processes resume with minimal human management.
Rewilding Europe has been at the center of this movement, supporting projects across more than a dozen countries. Their work draws on growing scientific evidence that large herbivores are keystone species — animals whose presence has disproportionately large effects on the ecosystems around them. Remove them, and ecosystems simplify. Return them, and complexity follows.
The E.U.’s Nature Restoration Law, which came into force in 2024 C.E., has added legal weight to these efforts, requiring member states to restore degraded ecosystems across millions of hectares by mid-century. Projects like the Côa Valley are no longer fringe experiments — they are increasingly central to how Europe plans to meet its biodiversity commitments.
The bison in Portugal’s Côa Valley will be watched closely — by scientists, by the rewilding community, and by the wolves that already call this valley home. What happens next will help shape how far, and how fast, Europe’s wildest ambitions can go.
Read more
For more on this story, see: Good News Network
For more from Good News for Humankind, see:
- Indigenous land rights recognized ahead of COP30 across 160 million hectares
- Ghana establishes new marine protected area at Cape Three Points
- The Good News for Humankind archive on wildlife conservation
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