Extinct Large Tortoiseshell Butterfly Resurfaces Across Southern England

The Large Tortoiseshell butterfly, once considered extinct in Britain after disappearing more than 30 years ago, has been spotted across six counties in southern England — raising hopes of a remarkable natural comeback. Butterfly Conservation, the UK's leading butterfly charity, has reported the sightings with cautious optimism.

The Large Tortoiseshell was once a familiar sight in English woodlands and gardens, but its population declined sharply during the latter half of the 20th century. By the early 1990s, it had effectively vanished from British shores, with the last confirmed breeding population disappearing. The reasons for its decline were debated among entomologists, with factors including parasitic flies, habitat loss, and climate changes all proposed as contributing causes.

“Butterfly Conservation, the UK's leading butterfly charity, has reported the sightings with cautious optimism.”

Now, verified sightings across six southern English counties suggest the species may be naturally recolonizing from continental Europe. The Large Tortoiseshell remains widespread across much of mainland Europe, and warming temperatures in southern England may be creating conditions favorable for the species to re-establish itself on British soil.

Butterfly Conservation has been carefully documenting and verifying each sighting to distinguish genuine Large Tortoiseshells from the similar but more common Small Tortoiseshell. The organization has confirmed that the butterflies spotted are indeed Large Tortoiseshells, identified by their larger size, subtly different wing patterns, and preference for different habitats.

While experts caution that it is too early to declare the species has permanently returned, the breadth of sightings across multiple counties is encouraging. If the butterflies are successfully breeding in England, it would represent one of the most significant natural recolonization events in British butterfly conservation history.

The news has energized butterfly enthusiasts across the country, with citizen scientists playing a crucial role in monitoring and reporting sightings. The potential return of the Large Tortoiseshell serves as a reminder that nature can sometimes surprise us with its resilience and capacity for recovery.