Nearly a decade after arriving in Romania’s Carpathian Mountains, a bison from Sweden is helping write a new chapter in the recovery of a species once extinct in the wild. 

In 2017, a young European bison named Bilbo arrived in Romania's Carpathian Mountains after a long journey from Sweden. He was entering a landscape his ancestors had once inhabited, but one where their presence had been missing for generations. 

His new home was Bison Hillock, an acclimatisation area in the Țarcu Mountains, where animals brought from breeding centres gradually adjust to life in the wild. For Bilbo, the transition proved successful. He adapted to his surroundings and went on to contribute to new generations of bison now roaming the forests and meadows of the Southwestern Carpathians. 

It was a small but significant step in one of Europe's most ambitious wildlife recovery efforts. 

A century ago, the European bison was on the brink of disappearing forever. Once widespread across the continent, the species had been driven to extinction in the wild by hunting and habitat loss. By 1927, no wild European bison remained. Its survival depended on a handful of animals kept in captivity. 

Today, their descendants are returning to landscapes where bison had not been seen for generations. But bringing back Europe's largest land mammal involves far more than releasing animals into the forest. 

Bringing back more than bison 

The return of bison to Romania's Țarcu Mountains began in 2014, through a rewilding initiative led by WWF-Romania and Rewilding Europe, alongside local partners and communities. 

The ambition was to establish a self-sustaining wild population, capable of breeding, dispersing and eventually thriving with minimal human intervention. 

For an animal that can weigh up to 900 kilograms, finding its place in a landscape shared with people is no small challenge. Bison must learn to navigate unfamiliar terrain, find food through harsh winters and establish stable social groups. Conservationists must manage the genetic legacy of a species descended from so few surviving animals, while addressing risks from disease, habitat fragmentation and potential conflicts with human activities. 

Yet the benefits of their return extend well beyond the species itself. 

Bison are sometimes described as ecosystem engineers. Their grazing and browsing influence vegetation, their movements create openings in dense habitats, and the seeds they disperse help shape the plant communities around them. 

In landscapes where large herbivores have been absent for decades, restoring these natural processes can support a richer mosaic of habitats for other wildlife. 

This is what rewilding ultimately seeks to achieve: not simply bringing animals back, but restoring the ecological relationships that allow nature to function and regenerate. 

And that takes time. 

What hope looks like in a biodiversity crisis 

Bilbo's story is unfolding against a far more troubling global picture. 

WWF's Living Planet Report reveals a 73% average decline in the size of monitored wildlife populations between 1970 and 2020. Behind that figure lies a growing body of evidence that ecosystems around the world are under pressure from habitat destruction, overexploitation, pollution, invasive species and climate change. 

The scale of the decline can make the prospects for wildlife recovery appear bleak. But the return of European bison offers an important counterpoint. 

Extinction in the wild need not always be permanent. 

The European bison survived because people intervened when the species was close to disappearing entirely. Breeding programmes preserved the remaining animals, while decades of conservation work created opportunities for their descendants to return to the wild. 

A new generation in the Carpathians 

Over the years, Bilbo was joined by other bison, including Legolas and Gimli. Like Bilbo, their names were inspired by J.R.R. Tolkien's fictional world, an unlikely literary connection in a very real conservation story. 

Their arrival was part of a carefully managed effort to strengthen the growing population and improve its long-term prospects. 

Today, bison born in the wild are helping establish a new generation in the Țarcu Mountains. Their presence is a sign of progress, but the ultimate test lies ahead. 

A successful reintroduction is not measured simply by the number of animals released or calves born. It is measured by whether a population can survive over generations, maintain genetic diversity, expand into suitable habitats and coexist with the people living nearby. 

For the communities of the Southwestern Carpathians, the return of bison also presents opportunities. Wildlife-based tourism and other local economic activities can create incentives to protect the landscapes on which both people and animals depend. But ensuring that these benefits are shared, and that potential conflicts are addressed, remains an essential part of the effort. 

Nearly a decade after Bilbo's arrival, the story of the European bison in Romania is still being written. 

The species' recovery will depend on sustained conservation work, connected habitats and the willingness to make room for large wildlife in a continent increasingly shaped by human activity. 

For Bilbo, the journey began with a move from Sweden to Romania. For the European bison, it is part of a much longer journey back from the edge of extinction.