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. Glass facades and corner windows. Bus stops and glazed tunnels. Noise barriers and office buildings.

How it works: Birds see UV light differently than humans. The birdpen® uses this fact to make windows more visible to birds, without altering how your glass looks to you. Whether you're using UV marker stripes or decals, these solutions work best when applied on the outside (approach side) of the window. They combine discreet appearance with high effectiveness, helping birds detect and avoid glass in time.