Frighten birds away inexpensively. Terror Eyes have scary holographic eyes on both sides which appear to move and follow birds as they fly around the Terror Eyes. Terror Eyes represent a constant watchful predator to which birds do not acclimate. Use Terror Eyes to eliminate those nuisance birds. The Terror Eyes ball is made of heavy duty vinyl and measures 24 inches in diameter. Bird Scare Coverage: Up to 6,000 feet (line-of-sight) Bird Scare Pests: Pigeons, sparrows, starlings, gulls, woodpeckers, swallows, crows, blackbirds, grackles, geese, and more Bird Scare Uses: Parking lots, building roofs, ,docks,boats,rafters,warehouses, airports, substations, outdoor restaurants, marinas, highway & bridge underpasses, granaries, orchards, vineyards, feed lots, farm fields, gardens, homes and more.