Light Pollution and Nocturnal Animal Welfare

Artificial light at night disrupts the behavior, physiology, and welfare of nocturnal and crepuscular animals across diverse taxa.

Key Facts

Artificial light at night has increased globally at approximately 2% per year since 2012
Nocturnal insects show dramatic mortality increases around artificial lights
Sea turtle hatchlings are disoriented by coastal lighting, moving inland instead of seaward
Migratory birds collide with illuminated buildings in numbers reaching billions annually
Light pollution affects melatonin production in birds, disrupting seasonal reproductive timing

Welfare Considerations

Light pollution creates welfare harms through multiple mechanisms. Nocturnal animals attracted to lights experience exhaustion from endless circling, predation, and dehydration. Sea turtle hatchlings disoriented by coastal lighting face certain death moving inland instead of to sea. Songbirds experience disrupted circadian rhythms from overnight illumination, with downstream effects on immune function and reproductive success. The welfare harms of light pollution are largely preventable through relatively simple interventions: directing lights downward, using amber wavelength bulbs, and turning off non-essential lights at night.

What You Can Do

Use downward-directed, amber LED outdoor lighting to reduce wildlife impact
Turn off non-essential outdoor lighting during migration seasons
Support dark sky designation for areas with significant nocturnal wildlife
Advocate for wildlife-aware lighting standards in coastal turtle nesting areas
Join citizen science programs monitoring light pollution impacts on local wildlife