The UK's warmest spring on record has ignited a potential explosion in butterfly numbers this summer, with experts predicting a 'colourful spectacle' as species like the Holly Blue and Red Admiral thrive. Professor Richard Fox, head of science at Butterfly Conservation, says the prolonged sunshine has given butterflies the perfect conditions to mate and lay eggs for the next generation.
Butterflies are cold-blooded creatures that rely heavily on warmth to survive, and this year's unseasonable heatwave has allowed them to carry out their vital life cycle activities with ease. This is in stark contrast to 2024, which was described as one of the worst years on record for butterflies.
The good news continues, with certain species already experiencing a successful spring, boding well for their numbers throughout the summer months. However, Professor Fox warns that prolonged dry weather poses a significant threat to caterpillars, the next stage in the butterfly life cycle. A lack of rain can lead to wilting plants and dying grass, leaving these developing insects without a vital food source.
To track population trends and better understand the current situation, Butterfly Conservation is urging thousands of people across the UK to participate in the Big Butterfly Count. By recording the number of butterflies seen in just 15 minutes, individuals can help experts monitor the health of butterfly populations and identify areas requiring attention.