Window strikes are one of the largest preventable sources of wild bird mortality, killing an estimated 600 million birds annually in North America alone.
Window collisions cause both instant death and prolonged suffering from injuries including concussions, internal bleeding, and broken bones. The scale is enormous — only cats kill more birds among human-associated causes. The solutions are well-established and increasingly cost-effective. Building design that incorporates bird-safe glass from the start is more effective and less expensive than retrofit solutions, making advocacy for building codes a high-leverage intervention.