Moth Welfare and Light Pollution

Artificial light at night disrupts moth behaviour, navigation, reproduction, and survival, with welfare and ecological implications across billions of individuals.

Key Facts

UK moth populations declined by 28% between 1968 and 2016
Light pollution disrupts circadian rhythms in moths affecting feeding and mating behaviour
Artificially lit moths are more vulnerable to predation as they become conspicuous
Moth larvae are critical food for farmland bird chicks in summer
Garden lights, street lighting, and illuminated buildings all contribute to moth decline

Welfare Considerations

Moths attracted to artificial light become disoriented, unable to navigate, feed, or mate effectively. Trapped in light traps or exhausted around light sources, they are highly vulnerable to predation and dehydration. Prolonged light exposure disrupts sleep patterns and immune function. The scale of moth mortality from light-related disorientation across the entire population may be enormous. While moth sentience is debated, the scale of population decline from light pollution and the ecological cascading effects on insectivorous bird chick survival argue strongly for precautionary lighting reform.

What You Can Do

Use warm-spectrum LED outdoor lights rather than blue-white LEDs
Install motion-sensor lighting to reduce continuous illumination
Turn off unnecessary lights at night especially in garden and rural settings
Advocate for dark-sky policies in local planning guidelines
Support Butterfly Conservation moth monitoring programs and garden moth counts