Where to Use Small gardens, balconies, domestic roofs. How it Works The Action Owl provides a threat to pest birds, as one of their predators. The sprung head moves around, creating a more realistic effect. How to Install The Owl can be filled with sand, water or cement. Mount the Owl up as high as possible, getting the threat above the pest birds if possible. Move the Owl on a regular basis so the pest birds do not become comfortable with it in the same position. Leaving the Owl in the same position for a prolonged period of time can result in the pest birds sitting next to or on top of the decoy!