With a small LED picture projector you could project hawk/owl movies on those moving vanes. Birds are hard wired to detect and avoid hawks/owls, so such a proj

With a small LED picture projector you could project hawk/owl movies on those moving vanes. Birds are hard wired to detect and avoid hawks/owls, so such a project at a cost of ~~$500 per tower would help. They could even use UV LED projectors for a night viewable hawk. Just a hint would send the bird into evasion mode. Making the hawk seem to originate on the blades would optimize the evasion away from the blades. It could even run on solar?