Large Tortoiseshell Butterfly Declared Resident Species in the UK
The large tortoiseshell butterfly is now officially recognized as a resident species in the UK, a significant development considering it was declared extinct in the last century. This remarkable comeback is underscored by the butterfly’s recent sightings in woodlands across Kent, Sussex, Hampshire, Dorset, Cornwall, and the Isle of Wight.
For the first time in the 58-year history of Butterfly Conservation, the large tortoiseshell has been classified as resident rather than migratory. Richard Fox, a spokesperson for the organization, remarked, “It is resident and therefore it is another species to add to Britain’s total, which is good news.” This classification reflects a broader trend in the UK’s native butterfly count, which has now increased to 60 with the return of this species.
The large tortoiseshell butterfly, larger than its smaller counterpart, the small tortoiseshell, is distinguished by its lack of white markings. Historically, it flourished in Britain during the 1940s but faced extinction by the 1960s, primarily due to factors such as Dutch elm disease. Its recent resurgence is believed to be linked to population increases in the Netherlands and France, as well as changes in climate.
Caterpillars of the large tortoiseshell have been found feeding in the wild since 2020, confirming that the butterfly is breeding again in Britain. These caterpillars feed on various trees, including elm, willow, aspen, and poplar. The adult butterflies hibernate and emerge in spring to mate and lay eggs, with this year’s offspring expected to take flight during midsummer.
Butterfly Conservation is actively encouraging the public to log sightings of the large tortoiseshell using the iRecord app, which will help track the butterfly’s distribution and population growth. Richard Fox noted, “The signs are really positive, which is lovely,” highlighting the optimism surrounding this species’ recovery.
Despite the encouraging signs, details remain unconfirmed regarding whether the large tortoiseshell will be widespread across multiple landscapes in the UK. Observers are keen to monitor its expansion and establish the butterfly’s long-term viability in the region.
The return of the large tortoiseshell butterfly serves as a reminder of the importance of conservation efforts and the potential for species recovery in the face of environmental challenges. As the butterfly continues to adapt and thrive, it offers hope for the future of biodiversity in the UK.
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