Home / Environment / Rare Butterfly's Glow Unlocks Conservation Secret
Rare Butterfly's Glow Unlocks Conservation Secret
14 Jun
Summary
- A rare black hairstreak butterfly population was discovered in Surrey.
- UV light revealed glowing caterpillars, aiding conservation efforts.
- This new technique is promoting nationwide UV surveying for butterflies.
An amateur lepidopterist's discovery of a rare black hairstreak butterfly population in Surrey has spurred a significant conservation research breakthrough. Gareth Tilley found the elusive species, previously documented only between Oxford and Peterborough, during walks in 2020. Initially met with skepticism, Tilley collaborated with conservationists and a university to confirm the species' presence.
The challenge of monitoring these butterflies, whose caterpillars, chrysalises, and adult forms are highly camouflaged, was overcome when Tilley learned some US caterpillars emit UV light. Using a UV torch in May 2022, he discovered that Surrey's caterpillars glowed brightly, enabling him to find 46 in a single evening.
Butterfly Conservation recognizes the importance of this discovery, endorsing UV surveying nationwide to find hairstreak populations. This method is not only effective but also creates an engaging way to involve volunteers in conservation efforts. Tilley is now sharing this technique with conservation groups internationally.
