These Bird Window Stickers are vital for protecting garden birds, as they help to prevent deadly collisions. Most glass reflects the surroundings, tricking birds into thinking they can fly through. This leads to an estimated 250,000 bird deaths per day in Europe alone. Many birds don't die on impact but later succumb to their injuries, so the true number harmed is likely higher. By using these easy-to-see black silhouettes on windows, people can dramatically reduce the risk. The stickers also save nestlings during breeding season. Without a mother to provide food, baby birds of many species - including blackbirds, tits, robins, sparrows, and woodpeckers - risk starvation. These all-season stickers belong on any glass surface where birds may fly. Their simple application saves countless lives. Contains 5 bird silhouette stickers.