Collisions are most commonly caused by the reflective characteristics of glass. Because glass reflects the environment around it, birds do not recognize it as a barrier. The birds see the reflected environment, such as trees and sky, and collide with the glass assuming it is a clear flight path. Any window, large or small can be a killer.

 

Birds are frequently killed in these collisions or are stunned, only to die of internal injuries later. It is estimated that one billion birds die as a result of window collisions every year in the United States alone. According to Dr. Daniel Klem of Muhlenberg College, “Intensive studies at single homes reveal one out of every two strikes results in a fatality.” He adds, “Glass is an indiscriminate killer that takes the fit as well as the un-fit of a species’ population.” 

 

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