Picture the perfect morning: songbird voices filling the air with their joyful chorus, announcing the new day. Then a sickening thud. Sadly, this heart-wrenching sound is all too familiar. What many do not realize is the staggering scale. New research (Kornreich et al., 2024, PLoS One) indicates that up to one billion birds may die annually from window strikes in the United States alone. This study also revealed a grim reality: only about 40% of birds ultimately survive, and only if they get care. Those that fly away rarely survive their hidden injuries.
The tragic irony is that our well-intentioned efforts to welcome birds with feeders, water features, and habitat gardens inadvertently put them in danger. These generous offerings, while enjoyable, cannot outweigh window mortality.
The good news? These tragedies are both predictable and preventable. We can significantly reduce this silent crisis with practical solutions available to homeowners and building managers alike.
Understanding the Invisible Threat
Birds cannot perceive glass as we do. To them, windows create lethal illusions, reflecting surrounding vegetation and sky or offering deceptive “tunnels” through buildings. This fundamental misperception makes glass one of the deadliest human-created hazards for birds.
Interestingly, the most dangerous buildings aren’t skyscrapers – they represent less than 1% of bird deaths. Low-rise structures account for most strikes, with 44% occurring at 1-3 story homes and another 56% at similar height commercial buildings (Loss et al., 2014, Condor).
Any window can be deadly, but some are worse: large picture windows mirroring vegetation or sky, glass corners, transparent walkways or railings, and night-lit facades. The more energy efficient, the worse the glaze creates a mirror. Prevention is simple: make glass visible with patterns that follow the “2×2 rule”— visual elements spaced no more than two inches apart horizontally or vertically and cover the entire window.
Your Bird-Saving Toolbox
Collision solutions are installed outside the window since the outer reflection needs addressing. They come in three basic forms: attaching directly to the window (films, adhesives), out from the window (netting, screens, cords), and window-friendly glass.
The most effective solutions are installed 3-6 inches from the window, preventing contact with the glass. Installed taut, they become trampolines that birds either grasp or bounce off. Films and adhesives are more practical for large windows and situations in which access is limited or difficult. Cost varies dramatically from super affordable to expensive. DIY or professional installations are options, with some products offering DIY tips.
Viewability is excellent for most solutions—particularly dotted films and netting—because our eyes quickly adapt. The following simple solutions offer multi-year durability and a wise long-term investment in bird safety.
Films and Stripes offer an elegant solution. The most popular are the strips with dots (Feather Friendly) or entire window films with dots or designs (Solyx Bird Safety Film, CollidEscape). Privacy glass films block reflection but retain your view (do not use nature scenes). They can be professionally installed or DIY. Visit the High Desert Museum for an example installation.
Bird-Safe or Other Tape. Painter’s tape provides a quick, inexpensive option ideal for less noticeable windows and emergency treatments. Several window tapes are available, such as “Bird-safe Tape” from Feather Friendly. Apply vertical or horizontal stripes or squares at least ¼-inch wide and spaced no more than 2 inches apart.
Paracord “Zen” or Acopian Curtains excel on sliding glass doors or operable windows. These consist of 1/8-inch paracord lengths hanging approximately 4 inches apart from a header bar mounted above the window. DIY instructions are on the Acopian BirdSavers website.
Garden Netting offers a highly affordable and easy solution. Choose garden netting that is 2×2-inch squares. For the simplest installation, hang on plant hangars placed at the windows’ four comers (turn upper hangers upside down). Make the netting taut and install 4-6 inches from the window. Reward yourself for saving birds as they grasp or bounce off the netting.
Solar and Insect Screens. These protect while preventing heat gain. Screens block reflections and cushion some impacts. Hardware store window screening can be framed or hung loosely. Window companies can create custom-sized screens. Hang 3″ to 5″ away from the window and taut. Professional solar shades can be solar-powered or manual.
Artistic Painting offers creative solutions for schools, bus shelters, or community projects where the view isn’t critical. Use tempera or acrylic water-based paints. Get creative treating windows with beautiful artistry. They can be fun and educational projects for children, seniors, or community groups, turning bird protection into an engaging public art opportunity.
Mobiles, Spinners, Reflective tapes, Chimes, and Patio Décor, installed strategically, can deter birds from striking windows. Hung off eaves or out from the window, they can also work to dissuade a woodpecker. They make excellent emergency solutions.
Start by prioritizing collision hotspots — windows where birds hit or are opposite feeders or vegetation—then gradually expand protection to other areas. To assess risk, look at windows outside at different times of day and various angles. Combine these efforts with making other bird-friendly habitat improvements. Even treating one window is a positive step toward supporting bird conservation.
This article appears in Source Weekly May 29, 2025.
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The technology exists to make window and door manufacturers make bird proof glass standard and required. What’s the hold up? Truth is, if a little money is involved…..corporations (people) don’t care.
I understand the sentiment. It does seem that much new commercial construction takes place without much thought of the effect on birds. However, a relatively large contingent of educational institutions, museums, and other commercial and public properties across the US and Canada are installing bird-friendly glass or retrofitting existing glass. There are even some cities that area passing regulatory rules requiring bird-friendly measures, including glass adaptations. It is sad that Bend, as progressive as it is, is not one of these cities. Let the city know you would be in favor of such rules. Native Bird Care