“The signs are really positive, which is lovely. It is resident and therefore it is another species to add to Britain’s total,” said Professor Richard Fox, a leading expert on butterflies. His statement highlights a significant ecological milestone: the large tortoiseshell butterfly, previously believed to be extinct in Britain for over 30 years, is now confirmed to be breeding again.

The large tortoiseshell butterfly, once widespread across the UK, was last recorded in the 1980s. Its disappearance was largely attributed to factors such as Dutch elm disease, which decimated the trees on which the butterfly lays its eggs. Recent reports indicate that this species has been sighted in various locations including Kent, Sussex, Hampshire, Dorset, Cornwall, and the Isle of Wight, marking a remarkable resurgence.

Since 2020, caterpillars of the large tortoiseshell have been discovered feeding on trees in the wild, providing strong evidence of breeding activity. This butterfly has now been confirmed as Britain’s 60th resident butterfly species, a testament to the ongoing efforts of conservationists and the natural resilience of wildlife.

Professor Fox further emphasized the importance of these sightings, stating, “If the individuals that are being seen can survive and reproduce then there’s no downside to the Large Tortoiseshell coming back.” This optimism reflects a broader trend in biodiversity recovery, where species once thought lost are beginning to re-establish themselves in their historical ranges.

Experts believe that climate change and increasing populations of the butterfly in Europe may be contributing factors to its return. The large tortoiseshell butterfly’s ability to adapt to changing environmental conditions could play a crucial role in its survival and expansion within Britain.

However, the precise reasons for the large tortoiseshell’s initial disappearance remain unclear. Details remain unconfirmed, leaving some questions about the future stability of this species in the UK. Nevertheless, the current trajectory suggests a positive outlook for the butterfly’s continued presence.

As conservation efforts continue, the large tortoiseshell butterfly serves as a symbol of hope for biodiversity in Britain. Professor Fox concluded, “I would imagine that, if things carry on with this trajectory, then when we compile our next GB Red List we may not classify the Large Tortoiseshell as regionally extinct.” This potential shift underscores the importance of ongoing conservation work and the need to protect the habitats that support such vulnerable species.

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The large tortoiseshell butterfly is now a resident species in the UK after being declared extinct in the last century. This marks a significant milestone in conservation efforts, as the butterfly has been sighted in woodlands across Kent, Sussex, Hampshire, Dorset, Cornwall, and the Isle of Wight.

This development is particularly noteworthy as it is the first time in Butterfly Conservation’s 58-year history that the large tortoiseshell has been classified as resident rather than migratory. Richard Fox, a representative from Butterfly Conservation, stated, “It is resident and therefore it is another species to add to Britain’s total, which is good news.” With the return of the large tortoiseshell, Britain’s native butterfly count has increased to 60.

The large tortoiseshell butterfly, which last flourished in Britain during the 1940s, is larger than its relative, the small tortoiseshell, and notably lacks the white markings found on the smaller species. Its caterpillars feed on a variety of trees, including elm, willow, aspen, and poplar. The species is believed to have returned due to population rises in the Netherlands and France, alongside climate change, which may have created more favorable conditions for its survival.

Caterpillars of the large tortoiseshell have been found feeding in the wild since 2020, confirming that the butterfly is breeding again in Britain. Fox remarked, “The signs are really positive, which is lovely,” highlighting the encouraging signs of recovery for this species.

The large tortoiseshell hibernates as an adult and emerges in spring to mate and lay eggs. Adult butterflies from this year’s offspring are 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 aid in tracking its distribution and abundance.

Despite the positive developments, details remain unconfirmed regarding whether the large tortoiseshell will be widespread across multiple landscapes in the UK. Fox acknowledged this uncertainty, stating, “We’re still in that zone of uncertainty at the moment, but there are exciting signs.” As observers continue to monitor the situation, the return of the large tortoiseshell butterfly stands as a testament to the resilience of nature and the effectiveness of conservation efforts.

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