How many birds die each year after colliding with windows? Are some species more susceptible than others?
The best estimate for the United States is somewhere between 400 million and 1 billion birds per year.
What other strategies work best to prevent bird collisions with windows?
In addition to using bird-friendly glass, there are after-market products that add subtle patterning to existing windows that make them more apparent to birds. Recent research at Oklahoma State University has demonstrated that these products are effective for decreasing collisions. Given the known influence of lighted windows at night, efforts to decrease building lights during periods of bird migration can be effective.
Q&A: Do we need a new approach to prevent bird window strikes?