Birds can be beautiful creatures, which is why it’s never good to hear a thump against your sliding glass door. That sound generally means that one of our feathered friends has struck the glass, thinking it was safe to fly through. So how does one stop this from happening? There are a number of methods, one simple and cheap way is by using these Window Alert UV decals on your windows.
The idea behind these is that the birds will see the UV rays reflected of of the decal, and think that there is something there. Thus, they will decide to take a different path, hopefully one in the opposite direction of the glass. $7 gets you a set of four, which is enough to cover 4 3′ x 3′ sections.