Window strikes kill up to one billion birds annually in North America alone, making glass collisions one of the leading human-caused bird mortality sources. Simple, affordable solutions can dramatically reduce strikes at homes and buildings.
Window strikes cause acute trauma, internal bleeding, and brain injury in birds. Many birds that appear stunned after a strike have severe concussions and die hours later from delayed trauma. Even survivors may suffer impaired flight, reduced predator avoidance, and lowered breeding success. The scale of this mortality — affecting hundreds of species including many declining populations — makes window strike reduction a high-impact, low-cost welfare intervention that individuals can implement immediately at home.