Birds flying repeatedly into windows is a common problem that many homeowners face. It can be alarming and frustrating when birds continuously bang into the glass, potentially injuring themselves or worse. Thankfully, there are several effective solutions to deter birds from window collisions.
In the opening paragraphs, I will provide a quick overview answering key questions about birds hitting windows:
Why do birds fly into windows?
Birds don’t see glass as a solid barrier the way humans do. They see the reflection of trees, skies, and other habitat in the glass and try to fly straight through. Birds also get confused by transparent windows and fly directly at them thinking it is a clear path.
What kind of birds commonly hit windows?
Songbirds such as robins, cardinals, chickadees, and sparrows are most prone to window collisions. These species are common in suburban neighborhoods where feeders and birdhouses may attract them close to homes. Larger birds like doves and woodpeckers can also hit windows.
What time of year do bird strikes occur most often?
Window collisions happen most frequently during spring and fall migration seasons. This is when large numbers of birds are moving through areas with lots of reflective glass windows near trees and feeders that appeal to them as stopover habitat.
When are bird strikes most likely to happen?
Birds are more active and flying during the early morning hours just after sunrise and in the late afternoons before sunset. These times see the highest rates of window collisions.
Why do some birds repeatedly strike the same window?
Some individual birds may repeatedly strike a particular window due to getting disoriented by reflective glass or transparent panes. Territorial birds defending their nesting areas against their own reflection can also cause repeated strikes.
Solutions to Prevent Birds Hitting Windows
Now that we’ve covered some key questions on why birds hit windows, here are some of the top solutions to deter collisions:
Apply decals and tape to glass
Placing decals, tape, or other patterns on windows can help alert birds to the glass surface. Vertical strips spaced closely across the window work best. Make sure to place decals on both the inside and outside of glass since birds can approach from either direction.
Install external screens
An external screen installed over the window several inches out from the glass is highly effective. The screening disrupts reflections and prevents birds from hitting the glass at full speed. External screens can be left up year-round or installed seasonally when collisions are most frequent.
Use UV liquid window coatings
Liquid glass coatings containing ultraviolet light patterns can be applied to windows and seen by birds but are invisible to humans. These UV coatings make the window appear solid to birds in flight. Reapplication is needed every 1-2 years.
Place bird deterrent films on glass
Deterrent films work like decals but cover the entire glass surface and can be more aesthetically pleasing. The films feature patterns that reflect UV light obvious to birds while allowing visibility through the window. Films should be installed on the exterior of windows.
Close exterior blinds and curtains
Drawing exterior blinds, shutters, and curtains can prevent reflections on glass. Keep them closed fully or partially during peak bird activity in the mornings and evenings when strikes are most frequent.
Install an angled glass panel
Slanted glass window panels set at a sharp 40-45 degree angle can help deter collisions. The angled glass reflects ground images birds may be less prone to fly toward. This solution is best suited for new construction or window replacements.
Place bird feeders and baths at least 30 feet from windows
Locating feeders and bird baths at least 30 feet away from windows reduces activity near the glass. This is an important accompaniment to other deterrents.
Use strings and other exterior window barriers
Installing taut parallel strings or similar barriers 3-4 inches apart across window exteriors creates an obvious physical block from the glass. The spacing prevents birds from flying between the barriers.
Use wind chimes and reflective tape for sounds and flashes
Wind chimes and reflective tape that move in the breeze can scare birds from windows. The sounds and flashing reflections warn birds away from the glass. Both deterrents should be installed well away from feeders where birds congregate.
Plant dense bushes and trees to block windows
Strategically planting bushes, trees, and other landscaping to block windows can deter collisions. The vegetation disrupts reflections and prevents clear flight paths to the glass. This option works best for larger plantings rather than small trees.
Comparison of Bird Deterrent Methods
To summarize some key differences between common solutions, here is a comparison table:
| Method | Effectiveness | Visibility | Cost |
|---|---|---|---|
| Decals/tape | Moderately effective | Visible | Low |
| External screens | Very effective | Visible | Moderate |
| UV liquid coating | Very effective | Invisible | Moderate |
| Films | Effective | Low visibility | Moderate |
| Blinds/curtains | Moderately effective | Visible when drawn | Low |
| Angled glass | Effective | Visible | High |
This comparison shows the relative pros and cons of different deterrent methods. Key factors are effectiveness at preventing strikes, visibility to humans, and installation costs. The best solutions balance maximum bird protection with reasonable aesthetics and expense.
Conclusion
Bird window collisions are extremely common but can be significantly reduced with some simple solutions. Applying decals, using UV coatings, installing screens, and other exterior deterrents are all effective options. Also be sure to move feeders away from windows and close blinds and curtains whenever possible. With some effort, you can prevent birds from tragically flying into your windows and enjoy their presence safely outside. Implementing safe bird-friendly solutions is rewarding for both homeowners and our feathered friends!
