Birds often mistake windows for open sky or reflections of trees, leading to fatal collisions. Up to a billion birds die annually in the U.S. from window strikes. Fortunately, there are simple and effective solutions to prevent these tragic accidents. This article will guide you through proven methods to make your windows bird-safe.
american goldfinch killed by window strike
Understanding Why Birds Hit Windows
Birds collide with windows for two primary reasons: daytime reflections and nighttime attraction to lights. During the day, windows reflect the sky or surrounding vegetation, creating an illusion of a safe passage. At night, especially during migration, artificial lights disorient birds, drawing them off course and towards illuminated windows.
imprint of dove on plate glass window
Identifying High-Risk Windows
Before implementing solutions, pinpoint the windows most prone to bird strikes. Large picture windows, windows at right angles to each other, and windows near feeders or reflecting vegetation are particularly hazardous. Observe your windows from a bird’s perspective to identify reflective surfaces.
Effective Bird Deterrents for Windows
Several methods can deter birds from flying into windows. The key is to break up reflections and make the glass visible to birds.
Visual Markers
- Decals and Stickers: Apply decals, stickers, or tape to the outside surface of the window in a grid pattern, spaced no more than 2 inches apart. For larger decals, a 4-inch spacing may suffice.
- Tempera Paint or Soap: Create a grid pattern or decorative design on the outside of the window using non-toxic tempera paint or soap.
- Dot Patterns: Specialized tapes and films with pre-spaced dot patterns offer a convenient and aesthetically pleasing solution.
reflection of foliage in window – hazard to birds
Physical Barriers
- Screens: Install external screens that cover the entire window surface.
- Netting: Hang netting at least 3 inches away from the window, creating a buffer zone to prevent impact.
- Acopian BirdSavers: These vertical cords hang down over the window, breaking up reflections and alerting birds to the glass.
One-Way Films
- Transparent Films: Apply specialized films that allow you to see out while making the window appear opaque to birds. These films can also reduce energy costs by minimizing sunlight.
Minimizing Nighttime Collisions
- Turn Off Lights: Switch off unnecessary outdoor lighting, especially during peak migration seasons.
- Shield Lights: Use downward-facing lights to minimize light pollution and disorientation for birds.
New Construction and Remodels
Incorporate bird-friendly design elements into new construction or renovations:
- External Shutters or Awnings: These can block reflections and reduce the visibility of windows.
- External Screens: Choose windows with screens installed on the outside.
Helping a Bird After a Window Strike
If a bird strikes your window, contain it gently in a dark, quiet box lined with soft material. Do not attempt to feed or water it. Contact a licensed wildlife rehabilitator immediately for further instructions.
By implementing these strategies, you can significantly reduce the risk of bird window collisions and contribute to avian conservation. Making your windows bird-safe is a simple yet powerful way to protect these beautiful creatures.
