WindowAlert

Site specialising in products - principally decals - to put off wild birds from killing or injuring themselves by flying into windows.
Easy-to-fix decals (static cling only, no adhesives) that reflect UV light and so are highly visible to birds. To human eyes they look like quite attractive etching on the window. UV reflectivity wears/washes off after a while (4 to 6 months?) so it pays to check them, either with a UV flashlight (they sell one for a few dollars) or, with experience, just by looking.
Efficient ordering and reasonably priced shipping, now with tracking.