GLOWWORMS
North Nibley has long been home to a thriving glowworm population, with recorded sightings dating back to the 1970s. Some areas on Nibley Knoll have even reported more than 50 individuals at a time. The habitat, open grassland beside scrub on limestone, is ideal for these fascinating creatures. Unfortunately, in recent years, the number of glowworms on the Knoll has declined.
Factors that can affect glowworm populations include habitat loss, changes in our weather, pesticide use, and light pollution. Male glowworms can be drawn to artificial lighting, which distracts them from locating glowing females. The North Nibley Biodiversity Group is gathering data on the current population, and the Tyndale Monument Trustees are working with them to understand if illuminating the monument could affect the glowworms during their mating season.
There is now an option to book the monument, with your personal message on our website and social media, but leave the lights turned off, and maybe help the glowworms. Simply tick "No lights" when you book.
Glow worms are visible only during their mating season, from mid-May through August, with June and July being peak breeding months. They only glow once it’s truly dark, so spotting them requires late-night walks.
