Artificial Light at Night and Wildlife Welfare: The Hidden Threat

Artificial light at night disrupts the biological rhythms, navigation, breeding behaviour, and predator-prey relationships of countless wildlife species, making light pollution one of the most pervasive and underrecognised welfare threats to wild animals.

Key Facts

The area affected by artificial light at night is growing by approximately 2% annually globally
Sea turtle hatchlings navigate to the ocean using the natural brightness of the horizon, and artificial light causes fatal disorientation
Migratory birds use star patterns for navigation, and artificial light causes disorientation leading to building collisions
Amphibian breeding is disrupted by artificial light extending perceived daylight into nighttime hours
Moth and insect populations decline significantly near artificial lighting, reducing food for bats and birds
Blue-spectrum light from LED lighting is particularly disruptive to wildlife biological rhythms

Welfare Considerations

Light pollution welfare impacts operate simultaneously on billions of individual animals across hundreds of species through multiple pathways. Disrupted circadian rhythms impair immune function, reproductive success, and predator avoidance. Navigation failures cause deaths through collision or disorientation. Altered prey availability affects predators throughout food webs. Unlike many wildlife welfare problems, light pollution is highly tractable: switching to warm-spectrum lighting, adding motion sensors, directing lights downward, and turning off unnecessary illumination at night are low-cost interventions with immediate welfare benefits. The gap between the scale of the problem and the simplicity of available solutions makes light pollution a compelling welfare action priority.

What You Can Do

Switch outdoor lighting to warm-spectrum amber or red LEDs which are less disruptive to most wildlife
Install motion sensors on outdoor lights so they are only active when humans are present
Turn off unnecessary interior lights visible through windows during bird migration seasons
Advocate for dark sky friendly lighting standards in your local authority planning guidance