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Large Tortoiseshell Butterfly Makes Rare UK Comeback
13 Jul
Summary
- The large tortoiseshell butterfly has reappeared in Britain after decades of absence.
- Sightings have been reported in Kent, Sussex, and Cornwall since early spring.
- Migrant butterflies from Europe are likely driving this resurgence in UK woodlands.
The large tortoiseshell butterfly, once a familiar sight in British woodlands, is making a remarkable comeback. This species, which had faded away after the Second World War and was declared regionally extinct in the 1960s, has begun reappearing across southern England. Sightings have been reported in Kent, Sussex, and Cornwall since early spring of 2026.
Experts suggest that a significant growth in large tortoiseshell populations in Central Europe has prompted an increase in migration across the English Channel. These butterflies are now believed to have become residents, establishing Britain's 60th breeding butterfly species. East Sussex is noted as a particular hotspot for these sightings.
The butterfly's disappearance was historically linked to Dutch elm disease, though its decline predated this. Its caterpillars can feed on various leaves, including willow, cherry, and poplar. The species hibernates in places like woodpiles or sheds until the following spring.
Recent excursions into woodlands like Abbot's Wood in East Sussex have offered glimpses of this elusive insect, with sightings described as rare but increasing. While a full sighting on a mature tree remains a goal for enthusiasts, the butterfly's presence signifies a positive development for British biodiversity.
