Avoid losing birds to strikes with windows
What can you do to avoid birds hitting your windows? Windows are invisible to birds. Lethal strikes have been documented by birds taking off from a perched position more than three feet from a window. Half of bird strikes are fatal, with the birds dying from head trauma. Window strikes occur year around and conservative estimates place the number of bird strikes in the U.S. alone at 100 million birds.
There is no one solution to this problem. Screens offer effective barriers, and moving feeders within 3 feet of a window will save many birds. It will improve your viewing, too. Birds rarely hit a window when leaving a feeder within this distance; no fatal strikes have been recorded when feeders are placed this close to a home because a bird does not have enough momentum to hurt itself from this distance.
Placing electrostatic decals with outlines of leaves, birds, hawks or other opaque patterns on windows can keep birds from striking if the pattern is oriented vertically in columns separated by four inches, or in horizontal rows separated by two inches. Greater spacing reduces, but does not eliminate, all strikes. The more elements used the greater the protection. It's important to place the objects on the outside of the glass. Birds can't see the items when placed on the inside of today's double and triple paned glass. You can find these elements at specialty nature stores. Also, opaque film on windows can help prevent bird strikes.