Wild Bird Window Strike Prevention

Window strikes kill an estimated 600 million birds annually in North America alone — simple preventive measures on buildings and homes can dramatically reduce this toll.

Key Facts

Birds do not see glass as a barrier — they fly towards reflected sky, trees, or vegetation and strike with fatal or injurious force.
An estimated 100-988 million birds die from window strikes annually in the United States alone.
Larger glass surfaces, particularly on modern glass-facade buildings, pose the greatest risk.
Treated glass with UV-reflective patterns is visible to birds but transparent to humans — the most effective preventive solution.
Simple interventions including window films, external screens, paracord hung close together, and tempera paint applied to glass all reduce strike rates significantly.

Welfare Considerations

Window strikes cause traumatic brain injury, internal haemorrhage, and death in birds that collide at full flight speed. Birds that survive the initial impact often die hours later from internal injuries or predation while stunned on the ground. The scale of this mortality — hundreds of millions of birds annually — makes it one of the largest human-caused sources of wild bird suffering. The solutions are straightforward, inexpensive, and available to every homeowner and building manager.

What You Can Do

Apply window film, tape strips at 5cm spacing, or UV-treatment to glass panes that birds frequently strike.
Move bird feeders either within 1 metre of glass (too close to build fatal speed) or more than 10 metres away.
Advocate for bird-safe glass standards in building codes for new commercial construction.
Support injured birds that survive strikes by placing them in a covered box in a quiet, dark place while contacting wildlife rehabilitators.