Tips to prevent bird window collisions

According to U.S. Fish & Wildlife service, 1 billion birds are killed due to collision with windows. By knowing the reason of collision, you can protect the birds. Birds see reflection of sky and plants in glass and think that there is clear path to fly - this is what results in collisions. There are several bird window deterrent solutions using which we can reduce the number of bird deaths. Use this link to read about the interior and exterior solutions and also about the techniques that do not work:

Source: http://birding.about.com/od/birdconservation/a/preventwindowcollisions.htm