Birds see their own reflection in a window and attack the "intruder" in order to protect its territory. This is known as territorial aggression.

 

While this behavior is not generally harmful to the birds, it can be very aggravating to homeowners. Territorial aggression is most common during breeding and nesting seasons.

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Cardinals, Robins , bluejays and TURKEYS on patio doors have been known to drive people crazy!

 

Prevent attacks due to territorial aggression by completely eliminating window reflections with a CollidEscape Guaranteed White, 

Imaged, or Tinted products.