Tape strips: Attach strips of chart tape on outside of window—either 1/4” vertical white strips (spaced 4” apart) or 1/8” horizontal black strips (spaced an inch apart). External shutters: Close them whenever windows aren't in use.

Apply the decals to a window, sit back, and admire your work! The side pressed to the window should be the side you did not color. Place and gently smooth them on. TIP: For maximum effectiveness against window collisions, decals should be placed no more than 2-4 inches apart on your windows.

Tape or decals on the exterior can be effective if you use enough of them to break up the reflection. Studies show that birds will attempt to fly through an area as small as your hand. You really need enough treatments, whatever they are, to ensure birds don't just zip between them (and straight into the glass).