FeatherGuard Window Sticker booklet reduces window strikes. It has been estimated that as many as 975 million birds are killed each year in North America in collisions with glass windows and buildings because the glass reflects the sky and habitat around it almost perfectly, creating a deadly optical illusion. Flying birds cannot discern between these reflections and reality, and the resulting collisions between bird and glass are always serious and often fatal to the birds. FeatherGuard is uniquely effective because it combines bright color, motion and the birds natural aversion to loose feathers. In nature loose feathers are often a sign that a bird has been killed by a predator. Try FeatherGuard today and make your windows safer for your wild birds. Each package includes one 6-feet FeatherGuard.