Wild Bird Window Strike Prevention

Window strikes kill hundreds of millions of wild birds annually in North America alone, making buildings one of the most significant human-caused threats to bird welfare.

Key Facts

An estimated 600 million birds die from window strikes annually in the US
Birds cannot perceive glass as a barrier and fly into reflections of sky and vegetation
Low-rise residential buildings cause more total bird deaths than skyscrapers due to numbers
Simple deterrents including window films, screens, and decals reduce strikes by over 70 percent
Migratory seasons represent peak strike mortality risk periods

Welfare Considerations

Window strikes represent an enormous, diffuse welfare problem for wild birds — hundreds of millions of traumatic collisions annually, most of which result in immediate death or delayed death from internal injuries. The scale of suffering is comparable to better-known threats like cats, yet receives far less attention. The welfare significance is heightened by the needlessness of the harm: effective prevention measures are affordable and widely available, making this one of the easiest large-scale wildlife welfare improvements any homeowner or building owner can make.

What You Can Do

Apply bird-safe window film or external screens to problem windows in your home
Move bird feeders to within 3 feet of windows or further than 10 feet away to reduce strike risk
Advocate for bird-safe building design standards in local building codes
Participate in citizen science bird strike monitoring programs to build evidence base