UV Marker Pen Birdpen® for Bird-Safe Windows

Make glass visible to birds, without visible stickers! If you want to protect birds from window collisions but prefer a discreet alternative to bird silhouette stickers, this transparent marker pen is an excellent solution. The set includes a marker pen with UV-reflective liquid and a scraper to remove the markings if needed. For best results, apply the liquid in vertical stripes on the outside of the window. These markings are nearly invisible to humans, but clearly visible to birds thanks to a special UV-reflective formula. Why window collisions happen: Birds can't recognise clear glass or mirrored surfaces as obstacles, they either see through it or are fooled by reflections of sky and greenery. In their natural habitats, they easily avoid obstacles. But in built environments, glass poses a serious threat: millions of birds die each year from window collisions. Common high-risk areas: Large windows and conservatories.