Glass windows kill up to one billion birds annually in North America alone, making window collision prevention one of the most impactful actions individuals can take for wild bird welfare.
Window strike mortality represents one of the rare cases where individual consumer action can have measurably large conservation and welfare impacts. The scale of the problem is enormous, and the solution at the household level is straightforward and affordable. Birds that survive strikes often suffer concussions, internal hemorrhage, and delayed death over hours or days — the acute suffering is significant even for survivors. Simple interventions like exterior window films with UV-reflective patterns or strategic netting dramatically reduce mortality with minimal cost or aesthetic compromise, making this a high-impact welfare improvement accessible to virtually every household.