Rare butterfly has good year at well-managed sites
Butterfly Conservation reports that Marsh Fritillaries have shown encouraging increases at carefully managed sites this season, highlighting the value of habitat restoration and volunteer effort.
Good news for a threatened species
Butterfly Conservation is reporting that one of the UK’s rarest and most beautiful butterflies, the Marsh Fritillary, has had a notably good year in areas where its vanishing habitat has been carefully managed.
Across several sites where Butterfly Conservation has worked with landowners and volunteers, numbers of Marsh Fritillaries have risen in 2025 compared with recent years, offering hope for a species that declined severely across the UK in the late twentieth century.
Strong local gains
At a farmland site in Northern Ireland, volunteers counted 139 Marsh Fritillary caterpillar nests, known as larval webs, this autumn — a substantial rise on last year’s 24 nests. In Dorset, carefully planned grazing and scrub control on Lydlinch Common helped staff record 88 larval webs — the highest figure since surveys began in 2004.
Volunteers and landowners make a difference
Rose Cremin, Butterfly Conservation’s Northern Ireland Conservation Manager, said: “This year’s results are great to see, not just because they show this special species had a good year, but also because they prove that the years of fantastic efforts by our volunteers and the farmers and landowners we work with are paying off.”
Butterfly Conservation staff and volunteers have been working at multiple sites to manage grassland and heathland habitat so that the sole food plant of Marsh Fritillary caterpillars — Devil’s-bit Scabious — thrives. Regular count surveys help track changes and guide ongoing habitat work.
Landscape-scale success
Butterfly Conservation Senior Ecologist Dr Rachel Jones, who co-ordinates Dorset surveys, explained that seeing strong numbers on several sites signals more than just isolated success: “Marsh Fritillaries need a landscape-scale approach, so when populations are doing well on multiple sites like this year, the effect can be greater than the sum of its parts. This work to maintain wildflower habitat also benefits numerous other species, so it’s good for nature, livestock and people.”
A reminder of what good management can achieve
This year’s warmest, sunniest UK spring and hottest summer on record provided ideal conditions for many butterflies to emerge successfully, but Butterfly Conservation emphasises that weather alone is not enough. The encouraging Marsh Fritillary results underscore the importance of sustained habitat restoration and good site management if rare butterflies are to thrive amid long-term pressures from habitat loss.
December 2025
Get Breaking Birdnews First
Get all the latest breaking bird news as it happens, download BirdAlertPRO for a 30-day free trial. No payment details required and get exclusive first-time subscriber offers.
Share this story
