Shiny, reflective surfaces act almost as an optical illusion to birds. When they see the mock predator eye and shiny reflective surface, they will be frightened, confused and want to avoid the area. Economical humane bird deterrentIridescent foil predator eye scares pest birds awayEasy to install, extremely effectiveMade of durable plastic for outdoor useIdeal for use in trees, overhangs, gazebos, patios, house eaves and boatsWill not damage trees or plantsSwivel attachment allows the bird diverter to rotate 360 degrees for added effectiveness