Wild Moth Diversity and Light Pollution Welfare

Moths face population declines from habitat loss, pesticide use, and light pollution that disrupts their nocturnal navigation, foraging, and reproduction with welfare implications for billions of individuals.

Key Facts

UK macro-moth abundance declined by 28% between 1968 and 2007 with larger declines in the south
Light pollution traps moths at artificial light sources where they circle exhausted until death or predation
Over 2,500 moth species exist in the UK alone, many specialized on specific host plant species
Moths are critical pollinators for night-flowering plants and prey for bats and many bird species
Caterpillar food plant availability depends on host plant species diversity in the habitat

Welfare Considerations

Moths circling artificial lights experience physiological exhaustion from sustained flight without feeding, eventual death from energy depletion, or predation at light sources that concentrate prey attractively for predators. The welfare harm of light pollution for individual moths is real and occurs billions of times across illuminated nights globally. Turning off unnecessary lights, using downward-directed fixtures, and switching to amber-spectrum lights that moths are less strongly attracted to reduces this welfare harm while also benefiting the broader nocturnal ecosystem that moths support.

What You Can Do

Turn off unnecessary outdoor lighting or install motion sensors to reduce light pollution impacts on moths
Use warm amber or red-spectrum outdoor lights rather than blue-white LEDs near gardens
Plant native flowers with tubular nighttime flowers that moths pollinate and caterpillar food plants for larvae
Support Butterfly Conservation and Moth Count programs monitoring moth population trends