The Anti-Wind community (yes, there really is such a thing) loves to make up problems that do not exist. One is to point out the bird kill problem with wind turbines. This is a “thing” because the first major wind farm in the country, Altimont Pass, had a bird kill problem. When it became evident that it was a problem, rather than hiding it or attempting to sweep it under the rug, they studied it. And it was learned what the factors were that led to significant bird and raptor kills in Altimont pass. As a result, they now no what to look for in siting wind farms. There are other subtlties like the fact that the ‘lattice towers’ were good nesting sites further attracting birds. And at the base they provided good cover for rodents, creating populations attractive to raptors. So now wind towers are made with tubular towers. In short this is a solved problem and there is minimal bird kill from wind turbines when compared to other human created problems such as house cats. Yes, house cats. Below is a list of some links to articles that address this in some depth.
National Geographic Article
USA Today article on bird kills from wind turbines
Now bats are a different story. I don’t think they have figured out what is going on there.