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What Experts Say


Dr. Daniel Klem Jr.* is a leading authority on bird-window collisions who has tested many anti-bird-crash devices under scientifically-controlled conditions.

He confirms that "that 'strings' work." He's tested this method. It's been found highly effective in protecting birds from striking windows, "either by visually alerting them to the window hazard or physically preventing them from hitting the unyielding surface." 

(Incidentally, just the opposite was concluded about decals. The Cornell Lab on Ornithology states that "Unfortunately, window decals rarely prevent bird strikes.")



David Allen Sibley, illustrator and author of The Sibley Guide to Birds, used the "string" method as well. He described how he "eliminated collisions entirely" by tying fishing lines vertically three inches apart in front of a window. From: BirdWatching Magazine, November 1, 2008. 

The Bird Crash Preventer employs the same effective technique -- but instead of the time-consuming job of tacking individual lines over a window, it provides a ready-to-hang curtain that  makes installation quick and easy.


Daniel Klem, Jr., Ph.D., D.Sc.
Professor of Biology, and
Sarkis Acopian Professor of Ornithology and Conservation Biology
Muhlenberg College, Allentown, PA 18104-5586 USA