Hundreds of millions of birds die annually from window collisions in North America alone; simple, low-cost prevention measures can dramatically reduce this toll.
Window collisions cause traumatic brain injury, internal hemorrhage, and broken bones. Many birds die on impact or shortly after from brain swelling. Survivors of sub-lethal strikes experience disorientation, pain, and vulnerability to predation during recovery. The scale of this mortality is enormous, with billions of birds affected globally each year. Because collisions are spread across billions of windows in homes, offices, and institutions, widespread adoption of prevention measures is needed for meaningful impact.