<p>Britain has a butterfly back.</p>
<p>The <strong>large tortoiseshell</strong> — a striking, orange-winged butterfly with dark bordered markings — was once a common sight across England and Wales. Then, gradually, it disappeared. By the 1980s, the species had ceased to breed in Britain entirely. Decades passed. It was considered locally extinct.</p>
<p>In March 2026, <strong>Butterfly Conservation</strong> officially declared the large tortoiseshell a <em>resident breeding species</em> of Britain once more. For the first time in nearly 40 years, the species has a home here again.</p>
<h2>How It Was Lost</h2>
<p>The large tortoiseshell's decline is one of the sadder chapters in British natural history. Its caterpillars feed primarily on elm leaves — and when Dutch elm disease swept through Britain in the 1970s and 1980s, killing millions of elm trees, the butterfly's food source was devastated.</p>
<p>The adults can feed on other trees and flowers, but without elms to raise their young on, populations collapsed. By the mid-1980s, breeding had stopped. Only occasional lone migrants, blown across the English Channel from continental Europe, kept the species on British species lists at all.</p>
<h2>The Return Begins</h2>
<p>Something shifted around 2020. Lepidopterists — butterfly scientists — began finding caterpillars. Not migrants blown off course, but wild caterpillars feeding on trees in Dorset. Then in Kent. Then Sussex. Then Hampshire and Cornwall and the Isle of Wight.</p>
<p>Year after year, the evidence mounted. The large tortoiseshell wasn't just visiting — it was staying, and it was breeding.</p>
<p>In March 2026, Butterfly Conservation made it official: the species is now a resident again.</p>
<h2>Why It's Back</h2>
<p>Experts point to several factors working in the butterfly's favour:</p>
<ul> <li><strong>Warmer temperatures</strong> — climate change has made southern England more hospitable for species that were previously at the northern edge of their range</li> <li><strong>Growing continental populations</strong> — large tortoiseshells are thriving in the Netherlands and France, increasing the number crossing the Channel</li> <li><strong>Elm regeneration</strong> — young elms have been regrowing across the south of England as suckers from old root systems, gradually restoring a food source</li> </ul>
<p>"We're genuinely excited," said Richard Fox, Head of Science for Butterfly Conservation. "The large tortoiseshell is establishing itself again, and we want the public to help us monitor how it spreads."</p>
<h2>What You Can Do</h2>
<p>If you're in southern England — particularly Kent, Sussex, Hampshire, Dorset, Cornwall, or the Isle of Wight — and you spot a large, orange-brown butterfly with distinctive dark borders, report it to Butterfly Conservation. Every sighting helps scientists track the species' recovery and understand where it's establishing itself.</p>
<p>This is nature doing what nature does when given a chance: finding its way back.</p>
<p>Britain has a butterfly back. Forty years is a long time to wait, but it came home.</p>
<p><em>Sources: The Guardian (March 9, 2026) · Butterfly Conservation · GB News · Darwin Tree of Life Project · inYourArea.co.uk · Evrimagaci.org</em></p>
