Butterfly Conservation reported robust insect counts across southwestern England during its 2026 annual survey. Approximately 5,000 participants in Devon documented 77,151 butterflies and day-flying moths over a three-week period, while nearly 3,000 counters in Cornwall recorded 47,712 insects.
Professor Richard Fox, head of science at Butterfly Conservation, attributed the strong numbers to favorable spring conditions for caterpillar development followed by warm, dry summer weather that benefited adult butterflies. However, he cautioned that the outlook may be less optimistic than current figures suggest. Extended drought conditions preceding the summer may have caused vegetation used as food plants by caterpillars to dry out prematurely, interrupting their feeding cycles. The full consequences of this potential stress are not expected to become apparent until the following year.
Fox referenced historical precedent for concern, noting that extreme droughts in 1976 and 1995 caused significant butterfly population declines, with some species never fully recovering. He emphasized that many butterfly species already face considerable pressure, with 80% of UK butterfly populations having declined since the 1970s. The combination of existing habitat degradation and climate-related stress could accelerate extinction risks for vulnerable species.
Looking forward, Fox warned that increasingly frequent hot and dry summers—predicted consequences of climate change—pose escalating threats to already vulnerable populations. He called the situation “a very sombre thought,” noting that reduced resilience to such weather events could produce “very difficult years ahead.”
Butterfly Conservation advised the public to support wildlife recovery through habitat enhancement measures, including planting trees and shrubs, installing water collection systems, and maintaining areas of unmowed grass. The gatekeeper butterfly emerged as the most frequently spotted species in both counties, while painted ladies demonstrated a particularly strong year nationally with over 13,000 recorded sightings across both regions.
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