There was a study a few years back that saw radical reduction in bird strikes simply by painting a single blade a contrasting color.
I believe bird strikes went down when they made the windmills much bigger, and the angular velocity of the blades much lower. Not building them on open truss towers encouraging birds building nests under them also helped.
If you’re interested, here is some info about the study I mentioned:
https://group.vattenfall.com/press-and-media/newsroom/2022/b...