The Defenders Wind Powered Plastic Action Owl Decoy is a full-size replica owl that is usually used to scare pigeons and other bird species that may have become a problem. The idea of using a plastic owl as a pigeon or bird scarer is to activate the pest bird's instinctive fear of predators. The Defenders Wind Powered Action Owl Decoy has a rotating and bobbing head that moves in just the gentlest of breezes. Owls with moving heads are proven to be more successful than owls with no moving parts at all.