Overview
- At least 20 recent reports followed a first 2026 sighting on the Isle of Wight on February 24, with records from Kent, Hampshire, Sussex, Dorset and Cornwall.
- Butterfly Conservation has added the Large Tortoiseshell to its First Sightings page to log emerging reports this spring.
- The species remains listed as regionally extinct on the 2022 GB Butterfly Red List, with any formal reclassification awaiting future assessments.
- Professor Richard Fox said a current update would probably remove the extinct label, though evidence of sustained local breeding is still lacking.
- Ecologists point to population growth in the Netherlands and early-spring emergence as likely drivers of the uptick, noting the species historically declined in Britain with Dutch elm disease.