Have you ever heard a bird hit a window? Or seen it?
Most people have. When you add up all those experiences, it’s evident that bird collisions with glass pose a significant hazard to birds. The problem is worse when birds migrate through cities and towns every spring and fall—thousands of birds can be killed each year at a single, large building. Even a single apartment or house can be a problem– research in Illinois found that windows on houses were struck by 1 to 4 birds each year.
Sometimes we see it; sometimes we don’t. Across North America, hundreds of millions of birds die from collisions every year.
Many species are affected from hummingbirds to hawks, including endangered species.