Window collisions kill hundreds of millions of birds annually in North America alone, with simple, inexpensive prevention measures available to dramatically reduce this welfare harm.
Window strikes cause death or serious injury to enormous numbers of birds annually. Stunned birds that survive strikes often die later from internal injuries including brain hemorrhage. Even apparently recovered birds may have subtle neurological damage affecting their long-term survival. The scale of this mortality is staggering - hundreds of millions of birds dying annually in the United States alone from a completely preventable cause. Simple and inexpensive prevention measures like window tape, physical barriers, or feeder relocation can reduce individual household strike rates by over 90%, representing genuine mass welfare improvement achievable by anyone.