Wildlife

Glow-worm Welfare in UK Grassland

Glow-worms are declining beetles whose bioluminescent females signal to flying males from short grassland, chalk downland and woodland rides, making habitat quality critical to their welfare and survival.

Key Facts

Only female glow-worms glow; they cannot feed as adults and must mate quickly
Populations have declined by 75% in the UK over recent decades
They require short, unimproved grassland with snail populations that larvae feed on
Light pollution is a growing threat as it interferes with mate-finding signalling

Welfare Considerations

Glow-worm welfare depends on the availability of diverse grassland habitats with stable snail populations and minimal artificial light interference. Habitat management that maintains short sward structure without eliminating the longer grass needed for pupation is a delicate balance requiring specialist guidance.

What You Can Do

Reduce artificial light use in gardens adjacent to known glow-worm sites at night
Support management of chalk downland and grassland that retains structural diversity
Record glow-worm sightings via the UK Glow-worm Survey to contribute to monitoring
Avoid pesticide use that reduces snail populations on which glow-worm larvae feed