PQ - I have a good friend who is involved with wind turbines and he has told me the only time in his knowledge there has ever been a large killing of birds by a wind turbine was when a flock of migrating birds went into one. This is why you would now have trouble building a wind farm in a known migratory bird path. As long as its not in a known path you shouldn't have mass killings - except for starlings of which there are too many of anyway. Occasional killings will happen but that happens when you build a tall building. This is 2nd hand info so someone else may have something to add.