Butterfly and day-flying moth numbers recorded in Devon and Cornwall were very strong this summer, but conservationists warn that prolonged hot, dry weather could cause populations to crash. Favourable spring conditions helped caterpillars, while sunny weather benefited adult butterflies, yet drought may have withered food plants before caterpillars finished feeding.

Almost 5,000 people recorded 77,151 insects in Devon, while nearly 3,000 counted 47,712 in Cornwall during the 2026 Big Butterfly Count. The Gatekeeper was the most commonly seen species in both counties, and Painted Ladies had a particularly strong year. Butterfly Conservation says 80% of UK butterfly populations have declined since the 1970s, with drought impacts potentially becoming clearer next year.