Wild Bird Window Strike Prevention

An estimated 600 million birds die from window collisions in the US annually, making buildings one of the leading human-caused sources of wild bird mortality.

Key Facts

Window strikes kill an estimated 365-988 million birds per year in the US alone
Birds cannot perceive glass as a barrier and fly into reflections of sky and vegetation
Most collisions occur at low-rise buildings, not skyscrapers
Fritted glass, screens, and external UV-reflective films can reduce collision rates by 70-90%
NYC requires new buildings to meet bird-safe glass standards
Collision deaths peak during spring and fall migration when billions of birds move through cities

Welfare Considerations

Window collisions cause traumatic injury and death in billions of individual birds each year. Birds that do not die immediately may suffer concussion, internal hemorrhage, and delayed mortality. This is largely a preventable form of human-caused wild animal suffering that building design and individual household actions can significantly reduce. The welfare impact - beyond population-level conservation concerns - represents massive unnecessary suffering across species from hummingbirds to hawks.

What You Can Do

Apply bird-safe film or tape patterns to home windows with collision history
Move bird feeders within 1 meter of windows or beyond 10 meters to reduce collision risk
Advocate for bird-safe glass requirements in new building codes in your city
Support organizations like the American Bird Conservancy that provide bird-safe building resources