Wildlife

Wild Bird Window Strike Prevention

Window strikes kill billions of birds globally each year. Simple modifications dramatically reduce mortality from this entirely preventable welfare harm.

Key Facts

Bird-window collisions kill an estimated 100-1000 million birds in the US annually
Large windows and glass corner buildings create greatest collision risk due to habitat reflection
UV-reflective window films visible to birds but not humans reduce strikes by 70-90%
Window decals spaced no more than 10 cm apart create visible barrier patterns effective at reducing strikes
Internal lighting at night creates light pollution that disorients migrating birds toward windows

Welfare Considerations

Window strikes cause immediate death or injury requiring rehabilitation in millions of individual birds globally. The welfare cost is both the impact injury itself and the disorientation that leads to repeated strikes in some cases. Prevention through film application is highly effective and low cost. Making windows visible to birds is one of the most accessible welfare improvements available to homeowners and building managers.

What You Can Do

Apply UV-reflective window film or close-spaced decals to large windows on your property
Reduce internal lighting visible from outside during autumn and spring migration periods
Report bird window strikes to monitoring schemes to contribute to collision mapping
Advocate for bird-safe glazing standards in commercial building planning requirements