Don’t know.............
Ask MIT Climate answers the question, do wind turbines kill birds, with yes, but house cats, buildings and fossil fuels kill more. Looks like deflection because of an agenda.
It continues they don’t know why. Visibility and migration patterns are possible causes. Slowing the blades down as a bird approaches might be a solution, sounds ridiculous.
AI has a similar answer.
The snail darter, spotted owl and California condor got a lot more interest and protection.
By the way, thanks for all the stuff you post. I’ve learned a lot over the years.