Urban environments present multiple lethal and welfare-compromising hazards for birds, with glass collisions, cat predation, and habitat loss among the most significant.
Urban landscapes are simultaneously home to significant bird populations and sources of multiple serious welfare hazards. Glass collisions cause acute injury and death at a scale that is difficult to overstate — even buildings with modest glazing contribute individually to what aggregates to billions of bird deaths annually. Cat predation is the largest direct human-associated source of bird mortality in North America. Light pollution disrupts migration and causes disorientation deaths. Despite these hazards, urban green spaces, gardens, and building design choices can substantially mitigate harm. Bird-safe glass treatments, cat containment, native planting, and lighting management are all practical, evidence-based interventions that reduce welfare harm to individual birds at meaningful scale.