Record heatwaves in 2026 led to Britain's second-best butterfly season in 16 years, according to the Big Butterfly Count. The world's largest insect survey, involving over 100,000 volunteers, recorded almost 1.4 million common butterflies and day-flying moths. The results confirmed what many nature enthusiasts observed: a remarkable profusion of butterflies during the five-heatwave summer.
Which Butterfly Species Thrived in the Heat?
Painted ladies, a migratory species that arrives in Britain each summer from sub-Saharan Africa, saw their numbers skyrocket by 335% compared to last year. This marked their second-highest count since the Big Butterfly Count began in 2010. The holly blue and gatekeeper both achieved their best-ever results, while the small copper recorded its third-best year. Overall, it was the best season since 2019.
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The Role of Record Heatwaves
Richard Fox, head of science at Butterfly Conservation, explained that adult butterflies thrive in hot, sunny weather for flying, feeding, and breeding. The prolonged heatwaves provided ideal conditions for these insects to flourish. However, the same dry conditions that boosted adult numbers may have dire consequences for next year's populations.
Drought Threatens Future Butterfly Populations
Butterfly Conservation warns that the drought affecting many parts of Britain could cause a collapse in butterfly numbers next year. This summer's caterpillars, which typically emerge as adults the following year, may have perished as grasses, wildflowers, and other essential plants shrivelled and died in the extremely dry conditions. Without adequate food sources, caterpillar survival rates plummet.
Comparison of Butterfly Counts: 2025 vs. 2026
| Species | 2025 Count | 2026 Count | Change |
|---|---|---|---|
| Painted Lady | ~40,000 | ~174,000 | +335% |
| Holly Blue | ~15,000 | ~30,000 | +100% |
| Gatekeeper | ~50,000 | ~95,000 | +90% |
| Small Copper | ~8,000 | ~14,000 | +75% |
Key Takeaways for Nature Lovers
- Record heatwaves created a boom in butterfly numbers, with painted ladies up 335%.
- The Big Butterfly Count engaged over 100,000 volunteers, counting nearly 1.4 million insects.
- Drought conditions may lead to a population crash next year due to caterpillar starvation.
- Butterfly Conservation urges the public to create habitats that support all life stages.
What Can Be Done to Help Butterflies?
While the immediate outlook is positive, conservationists stress the importance of long-term action. Gardeners can plant nectar-rich flowers and allow wild areas to grow, providing food and shelter for caterpillars. Reducing water usage during droughts and supporting conservation efforts are also crucial. The Big Butterfly Count continues to be a vital tool for monitoring these changes and informing protection strategies.
FAQ
What was the result of the 2026 Big Butterfly Count?
The 2026 Big Butterfly Count recorded the second-best British butterfly season in 16 years, with over 100,000 volunteers counting almost 1.4 million butterflies and moths.
Which butterfly species increased the most?
Painted ladies increased by 335% compared to last year, reaching their second-highest numbers since the count began in 2010.
Why might butterfly populations decline next year?
The drought caused many plants to wither, depriving caterpillars of food. Since caterpillars mostly become adult butterflies the following year, their survival is at risk.
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