Im not so sure its as simple as it might appear. Some of the reports I have seen by birders have said that the bird in Harris was flying erratically almost hitting people never mind wind turbines. Swifts, swallows etc catch insects a few mm in size in mid flight you would think that they are the most unlikely birds of all not to sense in one way or the other, the blades of a wind turbine.
I was in Orkney recently and there is a RSPB reserve at a place called Burgar Hil, the hide is almost underneath an 80m wind turbine. Red Throated Divers and Hen Harriers breed there, and there has never been a recorded collision.
Perhaps the degree of danger is to do with specific sighting of installations, bird species, weather conditions, birds ability to adapt their behaviour and a range of other variables.
I was in Orkney recently and there is a RSPB reserve at a place called Burgar Hil, the hide is almost underneath an 80m wind turbine. Red Throated Divers and Hen Harriers breed there, and there has never been a recorded collision.
Perhaps the degree of danger is to do with specific sighting of installations, bird species, weather conditions, birds ability to adapt their behaviour and a range of other variables.