# Bird collision mitigation in Germany

> Live situation record from CLSTR: https://clstr.news/situations/bird-collision-mitigation-in-germany
> Updated: 2026-08-16T10:03:01.000Z. Sources: 2. Developments: 2.

Conservation groups in Germany are advocating for the use of window markings to mitigate the high number of bird fatalities caused by glass collisions. The Nature and Biodiversity Conservation Union (NABU) estimates that up to 100 million birds die annually in Germany because they cannot recognize transparent surfaces or reflections of nature.

Experts recommend applying patterned stickers, vertical lines, or dot patterns to the exterior of windows to make the glass visible as a barrier. While previous methods like black silhouettes of birds of prey or UV markings have been used, conservationists note these are often ineffective. For maximum impact, markings should be high-contrast—such as black, white, orange, or red—and spaced no more than 9 cm apart to ensure birds perceive the glass as an obstacle.

## Timeline

### 2026-08-16: NABU recommends window markings to prevent bird collisions

To prevent the annual death of 100 million birds in Germany from glass collisions, NABU recommends using vertical lines or dot patterns on the exterior of windows to make glass surfaces visible.

2 sources. https://clstr.news/cluster/nabu-recommends-window-markings-to-prevent-bird-collisions

### 2026-08-05: Germany promotes window markings to reduce bird deaths from glass collisions

Germany urges the use of patterned stickers on windows to curb millions of bird deaths from glass collisions, a hazard highlighted by recent high‑profile incidents.

4 sources. https://clstr.news/cluster/germany-promotes-window-markings-to-reduce-bird-deaths-from-glass-collisions

---
Cite as: Bird collision mitigation in Germany. CLSTR, https://clstr.news/situations/bird-collision-mitigation-in-germany