A bird pecking at your window is not only annoying but can cause damage to the glass, as well. Some species of birds are highly territorial and want to fight other birds, particularly around mating season. Many birds mistake their reflection in windows as other birds and peck to make it go away. Although any bird can potentially display this bizarre behaviour, robins and cardinals are notorious for it. Implement a few easy solutions to keep the aggressive birds from potentially destroying your window and your peace and quiet.
Pull down the shades or close the blinds on your window. A white shade or closed blind hanging in your window often prevents a bird from seeing its reflection. If the bird doesn't see itself, it is likely refrain from the pecking.
Hang an object in the window to obscure the bird's view of itself. A window film or sun catcher hanging on the glass may keep the bird from seeing its reflection. Newspaper or other paper over the inside of the window typically works as well.
Apply inch-wide tape or ribbon vertically on the window every four inches to break up the bird's view of itself and likely keep it from attacking the glass.
Place bird spikes on the windowsill. The metal spikes make it impossible for the bird to land on the sill, thereby preventing it from pecking at the window.
Place indoor-outdoor blinds over your window. The blinds not only prevent the bird from seeing itself but also prevent any contact with the glass.
Tape a cut-out picture of a predator bird on the outside of the glass. A hawk or falcon hanging in your window is often enough to keep birds away, as they are likely afraid of the tough birds and don't want to attempt to fight with them.
Remove any potted plants in your window, as they often attract birds. Keep bird feeders away from your windows. Bird spikes, indoor-outdoor blinds and predator pictures are typically available at hardware stores or nature centres.