We have a windmill to pump water to our pond. It is not that big or tall and it is one by it's self.
Our neighbor has one as well, once again, not big or tall and set by his pond.
Quite a few of us have solar panels. A couple, three set either on the roof or on swivels.
You do not find any dead birds around because you do not have enough of them to impact things.
But when you have fields of windmills or fields of solar panels you have trouble.
The B75 turbine blade itself is 75 meters long, while the entire rotor assembly measures 154 meters in diameter. As it spins, the blades cover an area of 18,600 square meters—that’s roughly two and a half soccer fields—at a brisk 80 meters per second, or 180 MPH at the tips.
Moving that fast over such a large area generates a tremendous amount of force. About 200 tons of air press on the blade every second with wind speeds of just 22 MPH.
https://gizmodo.com/the-worlds-biggest-wind-turbine-blades-are-so-long-thei-5930272