Couldn’t resist.
We have hundreds of them down here and I’ve never heard any type of noise from them and as slow as they turn, birds would have to be pretty stupid to fly into them.
They sure screw up the skyline though.
There is several of them in a very, very, very, large area on I65 in Indiana, I stopped to look at them and count the revolutions once, they made no sound. Could not even hear the amps talking to each other.