More than half of Britain's native butterfly species have declined over the past 50 years, according to data from the UK Butterfly Monitoring Scheme (UKBMS). The scheme, which has collected over 44 million records since 1976, reveals that out of 58 native species recorded, 33 have declined, while 25 have increased in number. This decline is particularly pronounced among rarer 'habitat specialist' butterflies, which rely on specific plants or habitats such as wetlands, woodlands, or flower-rich grasslands.
Key Takeaways
More than half of Britain's native butterfly species have declined over the past 50 years due to habitat loss, pollution, and climate change. The UK Butterfly Monitoring Scheme (UKBMS) has collected over 44 million records since 1976, revealing significant declines in rarer 'habitat specialist' butterflies.
- Over half of Britain's native butterfly species have declined since 1976.
- Habitat loss, pollution, and climate change are driving the decline.
- Some adaptable species like the red admiral and comma have increased due to warmer weather.
- Conservation efforts have helped some rare butterflies, such as the large blue and black hairstreak, recover.
The UKBMS data shows that global heating has benefited some adaptable butterfly species. The purple emperor (up 136%), red admiral (up 330%), and comma (up 178%) have all expanded their ranges northwards due to warmer weather. However, rarer species like the high brown fritillary (down 66%), pearl-bordered fritillary (down 70%), and white-letter hairstreak (down 80%) are suffering serious declines.
The decline in butterfly populations is attributed to habitat loss, pollution, and climate change. Richard Fox, head of science at Butterfly Conservation, explained that changes in traditional woodland management have contributed to the rarity of certain species like the high brown fritillary. Additionally, nitrogen pollution from vehicles has caused grass to grow taller, making it too cool for some caterpillars to thrive.
Despite these challenges, conservation efforts have led to notable successes. The large blue butterfly, which was declared extinct in Britain in 1979, has seen its numbers soar by 1,866% since being reintroduced to specially managed grassland in Somerset. Other rare butterflies like the silver-spotted skipper (up 300%) and the black hairstreak (up 844%) have also benefited from conservation work.
The UKBMS is a collaborative effort involving Butterfly Conservation, the UK Centre for Ecology & Hydrology, the British Trust for Ornithology, and the Joint Nature Conservation Committee. Volunteers have walked more than 1.5 million kilometers weekly during the summer months since 1976 to collect data from over 7,600 sites across Britain.
The UKBMS results for 2025 revealed that despite Britain experiencing its sunniest year on record, it was only an average year for butterflies. This highlights the urgent need for continued conservation efforts to protect and restore habitats essential for butterfly survival.
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