Wild Bird Welfare and Light Pollution Effects

Artificial light at night disrupts the behavior, migration, physiology, and welfare of wild birds across multiple mechanisms at landscape scale.

Key Facts

Light pollution affects an estimated 30 percent of vertebrates globally according to research
Migratory birds are attracted to artificial light and may circle illuminated structures until exhausted
Dawn chorus timing is advancing as birds sing earlier in response to light pollution
Artificial light disrupts melatonin production in birds causing metabolic and reproductive effects
Light-dark cycle disruption affects immune function and cognitive performance in birds

Welfare Considerations

Light pollution welfare effects on wild birds span acute and chronic mechanisms. Acute effects include fatal attraction to illuminated structures during migration and disorientation that causes birds to circle until exhausted and die. Chronic effects include disrupted circadian rhythms, altered reproductive timing mismatched with food availability, and reduced immune function. The scale is enormous — billions of migratory birds pass through illuminated urban areas annually. Reducing light pollution through shielded fixtures, motion sensors, and lights-out campaigns directly benefits bird welfare.

What You Can Do

Turn off or reduce outdoor lights during spring and fall migration seasons
Advocate for bird-safe lighting policies in building design and urban planning
Support Lights Out programs in your city that dim skyscraper lights during migration
Use shielded outdoor fixtures that direct light downward rather than into the sky