These windmills are a real problem for birds. The tip of a blade is really moving at high speed and the birds have not learnt to watch out for them yet. We have one of these plants not too far away, and they kill off a decent amount of birds. It was a shame that they built the windmill farm in the middle of our most important breeding grounds for white tailed eagles.. Just one more thing to take into account when building these things be environmentally friendly. Especially when 99.9% of our electricity is produced with hydroelectric dam installations.