Toss a bat into a cage, one that has bars far enough apart that the bat can go through with its wings folded but not with them extended. The bat will fly around the cage a couple times, head straight for the bars, fold its wings and somersault through the bars and start flying again once it has gained its freedom. I have witnessed this and it is amazing.
The bats sonar,or radar if you will, tells him where things are, such as the cage bars and windmill blades. They would never run into a windmill. This is just BS. I am not an advocate of windmills BTW, but this is just another example of how greenies don't want any power transmission to take place.