The rare Marsh Fritillary butterfly has had an excellent year in Northern Ireland, thanks to warm weather and long-term conservation work. Once widespread, the species declined sharply as farming practices changed and its key food plant, Devil’s-bit Scabious, became scarce.
Recent surveys show major increases in caterpillar nests on managed sites. One location recorded 53 nests, up from 24 last year, while another rose from 24 to 139. Conservationists credit careful habitat management with farmers—such as controlled grazing and grassland restoration—for the rebound.
Butterfly Conservation’s Rose Cremin said good weather helps but cannot reverse long-term decline without proper habitat. The Marsh Fritillary produces just one brood a year, making it highly vulnerable to changes in food and habitat.
Despite this year’s success, the species has lost 43% of its range since 1985, and 80% of UK butterfly species remain in decline.
