Window strikes are one of the leading human-made causes of bird mortality. Every year, up to one billion birds in the United States lose their lives due to collisions with glass windows. These preventable incidents have far-reaching consequences for bird populations and ecosystems. Taking measures to mitigate it are simple and necessary for fostering coexistence between humans and wild bird populations.
Understanding Why Birds Fly into Glass
Birds often mistake reflections of trees, sky, or other natural elements for actual open spaces. This happens because they have a limited ability to perceive glass as a barrier. This illusion leads them to fly directly into windows at high speeds, resulting in serious injuries or death. Migratory birds are particularly vulnerable to window strikes. They often navigate through unfamiliar and confusing urban landscapes during their seasonal journeys.
Installing Window Treatments
One of the most effective solutions is applying window treatments that make glass surfaces more visible to birds. Options include decals, stripes, or patterns designed specifically to deter birds by breaking up reflections.
Installing screens or external shades can reduce reflections and provide physical barriers that protect birds. These measures are particularly effective in urban areas with high bird traffic.
Placement of Bird Feeders and Water Features
To decrease the chance of collisions, place bird feeders and water features close to windows (within three feet). Alternatively, position them far away (more than 30 feet). Having them close to glass surfaces does not allow birds to gain enough speed to cause serious injuries. Distant feeders keep them away from danger altogether.
By understanding the causes of bird-window collisions and implementing practical solutions, like window treatments, screens, and proper placement of bird feeders, we can significantly reduce bird mortality rates.
Vancouver Audubon 