Bird-window collisions kill an estimated one billion birds annually in North America alone, making it one of the most significant preventable sources of wildlife mortality.
Bird window strikes cause acute trauma — many birds die immediately while others suffer from concussions, internal bleeding, and disorientation before dying hours or days after the strike. The scale of mortality is enormous and preventable. Solutions range from simple and inexpensive (exterior tape or decal patterns) to architectural (bird-safe glass in new construction). The welfare opportunity here is large because most mortality occurs at houses, where individual homeowner action creates immediate impact.