White storks with their two-meter wingspans and enormous circular nests are returning to English skies after 600 years, sparking a surprising conversation about what "native" really means when it comes to rewilding. Multiple reintroduction sites have already released these majestic birds across England, with more planned and a public consultation now underway—but the move has divided experts and officials on whether non-native species belong in rewilding projects.
Natural England, the government's advisory body, maintains that white storks are not native birds. Yet other experts argue the species actually is native to Britain and was hunted into extinction around the 1400s. The disagreement hinges on how we define "native." According to official UK criteria, a native species is one that has been present throughout the last 12,000 years, including migratory birds that breed in or visit the region. By this standard, white storks occupy an unusual middle ground: they are definitely regular visitors to England and appear in the subfossil record over the last 4,000 years. This status means they do not technically require a license for release, even though they are not considered a priority for reintroduction.
The reintroduction raises legitimate concerns. Introduced non-native species can wreak havoc on landscapes—Japanese knotweed, brought to the UK by Victorians as an ornamental plant, now costs the country £247 million annually to control as it damages buildings and essential infrastructure. Invasive rats, cats, and other animals have devastated seabird populations by preying on eggs and chicks. Any new species could theoretically become invasive and disrupt native wildlife already struggling in the landscape.
Yet the case for white storks extends beyond nostalgia. These charismatic birds are viewed positively by most people, offering what rewilding projects desperately need: genuine public engagement with nature. In Poland, tourists travel hundreds of kilometers to see white storks, and stork villages have become managed tourism destinations where visitors encounter these iconic species up close. For rewilding projects funded partly through tourism, white storks offer tangible economic value alongside ecological interest.
The broader strategy of introducing non-native species as "ecological analogs" also has merit. The Kent Wildlife Trust's Wilder Blean project introduced European bison—a non-native species—to replicate the ecological role of the extinct steppe bison that once roamed Britain during the Pleistocene. These mixed feeders eat grasses, leaves, and woody plant parts, creating a patchwork of habitats that benefit numerous other species. The Scottish beaver trial, which introduced Norwegian beavers in 2008, initially raised similar skepticism. Eighteen years later, beavers have become a cornerstone of rewilding projects across the UK, from London to large Scottish estates.
Climate change adds another dimension to the conversation. As temperatures shift, species are naturally migrating to new regions with more suitable conditions. The southern small white butterfly, first spotted in the UK in 2025, arrived on its own from mainland Europe. But less mobile species may require human assistance to reach climates where they can thrive. As an island nation with many locally extinct species, Britain's conservation history has always depended on strategic introductions—the question now is simply which species deserve that help, and why.