Some birds, such as cardinals and robins, may attack their own reflections in glass windows or doors. These birds claim a home area and protect it by chasing away other birds. When a cardinal or robin sees its own reflection, the bird may think the reflection is another bird and peck at the window to chase away the “intruder.”
We don’t know of a trick that always makes birds stop pecking at their reflections. Some people tape a sheet of white paper on the inside of the window to reduce the reflection. Others have tried putting up a cutout that looks like the shadow of a falcon or some other enemy of the pecking bird. Maybe you’ll find the perfect solution.
Photo by: GettyImages|BirdImages