Guide 02
The goal is not to decorate a window. The goal is to interrupt the reflection or apparent flight path across the area a bird could try to fly through.
Exterior treatment is important because it changes what birds see before they reach the glass. Interior objects may not sufficiently break reflections on the outside surface.
USGS guidance describes dense patterns, including a two-by-two-inch spacing approach. That is why our calculator estimates a full grid instead of a few isolated decals.
Start where glass reflects vegetation or sky, where windows create a see-through corridor, or where collision evidence already exists. Walk outside and evaluate the reflection from the bird's approach side.
A temporary exterior pattern that covers the full risk area can be more useful than delaying action while shopping for a permanent architectural solution.
Window safetyAn exterior UV-decal option, not a guarantee. American Bird Conservancy notes UV patterns may be less visible in low light or shade. Follow dense, visible exterior coverage across the full risky pane.
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For a seasonal exterior check that complements this treatment guide, see the Field Journal story Before migration peaks, walk the glass from outside.