A recent study has found that more than 1 billion birds are killed annually in the U.S. due to collisions with windows, with many of these incidents occurring at homes and lower buildings. The study, conducted by scientists from Fordham University, the NYC Bird Alliance, the American Bird Conservancy, and Stony Brook University, highlights the significant impact of window collisions on bird populations.
Connie Sanchez, the program manager for bird-friendly buildings at the National Audubon Society, emphasised that the actual number of bird fatalities could be even higher as some birds may fly away after hitting a window and die elsewhere. The main cause of these collisions is attributed to light pollution, where artificial lighting from sources like streetlights, building lights, and porch lights attracts birds and causes them to crash into buildings and windows.
During the spring and fall migration periods, birds are particularly vulnerable to window strikes as they rely on celestial cues such as light from the moon and stars to navigate. Small songbirds like sparrows, warblers, and thrushes are at a higher risk of collisions during these times. Surprisingly, the majority of bird collisions occur at low-rise buildings and residences rather than high-rise structures.
To help mitigate the impact of window collisions, homeowners and renters can make simple changes such as turning off unnecessary lights, especially during peak migration periods. The National Audubon Society’s Lights Out Program encourages individuals to reduce excessive lighting to provide a safe passage for migrating birds. Additionally, using visual markers on windows, such as stickers, tape, or washable paint, can help birds perceive the barrier and avoid collisions.
Sanchez recommends pointing landscape lights downwards, using timers and sensors to control lighting, and avoiding leaving interior lights visible through windows. By taking these steps, individuals can contribute to making the skies safer for birds and reducing the alarming rate of window collisions that occur each year. As Sanchez emphasised, these small efforts at home can have a significant impact on bird conservation efforts.