I'm surprised they didn't try UV-reflective paint. Amazon sells decals [0] that people can stick to their windows to reduce birds flying into them. The Humane Society has other approaches. [1]
UV-reflective paint would hopefully be visible to birds and not to people so a windmill wouldn't be any more distracting than a current one. I could see where 20 or 30 windmills in sight, each with one black blade, might be visually distracting.
UV-reflective paint would hopefully be visible to birds and not to people so a windmill wouldn't be any more distracting than a current one. I could see where 20 or 30 windmills in sight, each with one black blade, might be visually distracting.
[0]https://smile.amazon.com/s?k=bird+window+decals [1]https://www.humanesociety.org/resources/make-your-windows-bi...