Glass windows kill an estimated 600 million to 1 billion birds annually in the US alone. Simple, proven solutions exist that dramatically reduce collision rates.
Window collisions cause rapid but not always instantaneous death; a significant proportion of birds that strike glass experience severe head trauma, fractures, and internal haemorrhage before dying. Stunned birds that survive the initial collision remain highly vulnerable to predation, exposure, and internal injury while incapacitated. The welfare harm is acute and occurs billions of times annually — making this one of the most numerically significant sources of wild bird suffering caused directly by human infrastructure. The clear availability of preventive solutions transforms this from an unavoidable tragedy to a preventable welfare failure at scale.