butterflies habitat restoration indicator species chalk grassland conservation

From Three Butterflies to Six Hundred: How Kent Pulled a Species Back From the Edge

11 June 2026

The population of the rare Duke of Burgundy butterfly in Kent has grown by over 9,000%, rising from fewer than 50 individuals in 2005 to nearly 600 in 2024. This recovery was achieved through collaboration between Butterfly Conservation, Natural England, and farmers, who created new habitats and planted food sources such as cowslips and primroses under government environmental land management schemes. Conservationists describe Kent as the standout example of this approach working, though the species has still declined by 89% across the UK since 1982.

In 2003, an entomologist named Dan Hore walked the chalk grasslands of Kent searching for one of Britain's most particular butterflies. He found three. Three Duke of Burgundy butterflies in the entire county, occupying a single patch of ground, clinging to existence by the thinnest of threads.

Two decades later, Kent recorded 591 of them.

The Duke of Burgundy is not a butterfly that tolerates compromise. Its caterpillars eat only cowslips and primroses — and not just any cowslips and primroses, but plants growing under very specific conditions of light, slope, and soil. Too much shade, the wrong aspect, a field that's been fertilised within the last few years — and the whole arrangement collapses. The butterfly demands a landscape managed almost exactly as it would have been centuries ago.

Across the UK, that landscape has been disappearing for generations. Since 1982, the Duke of Burgundy's distribution has contracted by 89% — a figure that lands differently when you understand what "distribution" means in practice. Not just fewer butterflies, but entire counties going silent. Populations blinking out one by one as rough grassland edges were smoothed away, as cowslips vanished from field margins, as the intricate patchwork of traditional farming was replaced by something more efficient and far less alive.

Kent was nearly part of that story. Instead, it became something rarer: a reversal.

Butterfly Conservation, working alongside Natural England and local farmers, began methodically rebuilding the habitat network the species requires. Landowners were encouraged to let the margins of low-yield fields grow differently — to plant cowslips and primroses where intensive crops had no business being grown anyway. The government's Environmental Land Management schemes added financial weight to the argument, giving farmers a reason to diversify income rather than push productivity from land that was never going to deliver it.

The result, says Hore, now director of nature recovery at Butterfly Conservation, is the single strongest example of this model working anywhere in England.

What makes the Duke of Burgundy more than just a conservation win is what it signals about everything else sharing its habitat. Butterflies are indicator species — biological shorthand for ecosystem health. When a population collapses, it tells you the web of smaller, less visible insects is likely collapsing too. When it recovers, as Hore puts it, "it tells you you're getting something right." The butterflies themselves contribute to pollination, threading themselves into the food chains of the chalk grassland communities around them. Each individual is a node in a network.

From three butterflies at one site to nearly six hundred across dozens — the arithmetic of that recovery, roughly a 9,000% increase since the low point of fewer than 50 in 2005, is almost difficult to process. But the more important number might be simpler: zero. The number of times this outcome was inevitable. It happened because specific people made specific decisions about specific pieces of land.

"You can recover even really restricted species," Hore said, "if you get the process right."