Glowworms return to North Yorkshire Reserve after a century
The bioluminescent beams of “fairy folk” are shining again from a nature reserve in North Yorkshire for the first time in a century after a successful no-frills reintroduction of endangered glowworms.
Female glowworms were spotted over multiple weeks at Nosterfield Nature Reserve this summer following an almost zero-budget project led by volunteer “glow-getters” and independent ecologist Pete Cooper.
The species — the much-loved beetles whose flightless females glow to attract males — has vanished from much of the British countryside in recent decades due to intensive farming, development, light pollution and loss of rough grassland. They are notoriously difficult to re-establish.
The team collected a small number of glowworms under licence from a local donor site, bred them in captivity and reared hundreds of snail-eating larvae in a garden shed in Bristol.
Larvae were first released at Nosterfield in 2024. Because glowworms take two years to reach adulthood, it was not until this summer that signs of success emerged.
Volunteers for the Lower Ure Conservation Trust counted up to 12 glowing females over successive weeks — a “huge relief” for Cooper, who has spent six years mastering the complexities of breeding and releasing glowworms and gave his time for free.”It’s a really great first indicator of initial success,” he said. “We know that glowworms can live out their full life cycle at this site — there is great food and plenty of mating opportunity, and it makes all that time and effort worthwhile.”Cooper is now developing formal standards and guidance for glowworm breeding, release and habitat management.
A profusion of glowworms at Nosterfield in 1909 was hailed by writer Edmund Bogg as “wont to hang out their fieldstar lamps… as if lit by the hands of fairy folk.” Their “love torches,” as Samuel Taylor Coleridge called them, were later extinguished by quarrying.
Since 1997, when the Lower Ure Conservation Trust bought its first 72 acres of disused quarry, the site has been restored to species-rich wetland and grassland on magnesian limestone. The charity will soon manage nearly 600 acres of former quarry, now home to booming bitterns and marsh harriers.
Simon Warwick, director of the trust, credited “the raw passion and enthusiasm” of Cooper and 80 volunteers who tweaked habitat management for the glowworms and monitored their emergence.
