Bird Safety Film is designed to deter birds from flying into reflective glass, thus suffering an injury or death. This film is easily applied to exterior glass, outside surface, and is made of a durable, crystal clear, outside weatherable, scratch resistant polyester film. This film has an expected outdoor life of 7 years and is cleanly and easily removed and replaced if needed. Our bird safety film has proved to be 100% successful. It is installed at the Philadelphia Zoo and Bronx Zoo and they have reported no fatalities since the bird safety film installation. The dots are specially designed to break reflections on the glass allowing the birds to see that there is an obstruction.