Birds read the reflection of nature in your windows as real and think they are traveling towards trees or sky or another bird–whatever is reflected. The WindowbAlert decals are nearly invisible (so you can barely see them when looking through the window) but the birds see UV light reflected back from the decal, thereby deterring them from flying into the window. Before applying the decals I made sure to wash the window and used rubbing alcohol to remove any residue.
It also helps if you place feeders and bird baths either very close to the window or away at an angle.
–Terry Powell
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