Bird Friendly Glass

Bird1st™ by Guardian Glass - Limit bird collisions with advanced UV coated glass

Bird Friendly Solutions

Up to one billion bird deaths in the United States are attributed to collisions with buildings and other structures each year. As glass continues to make up more and more of the external building envelope, it is likely that the number of birds affected by this problem could increase over the coming years. Building requirements are becoming more stringent across the world, which means architects are now looking for glass solutions that are safer and help to reduce the risk of bird collisions, whilst still providing the aesthetic and performance attributes that their projects require.

Collision Causes

Cities with a density of structures, including high-rise, can be the site of nighttime collisions due to light pollution (both interior and exterior lighting). Flocks of migrating birds collide with large buildings and this generates headlines and attention. However, suburban, low-rise buildings account for a much higher percentage of collisions; individual collisions may not be as evident but can happen more frequently.

In general, there are four ways buildings and building environments contribute to bird collisions:


Birds cannot differentiate between reflections of tree sky, or habitat, and the real thing. Even low-reflecting glass can act like a mirror when it is bright outside and dark inside. When coupled with certain façade designs, the reflections can create areas that are visually confusing to birds.


When there is a direct line of sight from one window to another (e.g. walkways, corners, bus stops, or transparent wind/sound barriers), birds do not perceive the glass as a barrier, and attempt to fly through, causing the collision. Also, birds can see wooded atriums or indoor plants as an inviting habitat.


The design of the building and its location can have a significant impact on the collision risk as well as the maximum effectiveness of deterrents. Building shape, location, and landscaping (especially the anticipated height of the tree canopy once mature) all have considerable impact on the collision risk profile of the facility.


Birds use the night sky and ambient light levels to aid their migration navigation. This causes nighttime collisions as lighting inside buildings, especially those buildings with potential habitat, attracts birds. Artificial lights, particularly those that point upward, can lure and trap birds in their haze, where they potentially die of exhaustion.

Our Solutions and Resources

Bird Friendly Glass by Guardian Glass North America - Limit bird collisions with advanced UV coated glass

Guardian Bird1st™

UV coating solution that help limit bird collisions while leaving views clear and open