People saying this is some kind of hoax have not done their research. As someone who works for a renewable energy company they do hit birds (and bats, which are attracted to their low-frequency hum). I thought it was kind of nonsense before this job, but up close you realize those blades are spinning FAST. Theres nothing like them in the animal kingdom so birds arent afraid of them. There are steps you can take to mitigate the threat, but it is a valid concern. On the whole, though, they are still much better for the environment than pretty much any other type of energy generation.