To date, we have no reported bird incidents with the Windspire wind turbine, and actually have one story of a bird who built a nest below the generator housing.  We believe the slow speed in which the Windspire turbine’s blades spin in comparison to the wind speed, also known as Tip Speed Ratio, allows birds to see the blades so they can fly clear of them.  We don’t have a specific bird safety study to cite, but we think this picture says a whole lot (maybe even 1000 words) on the subject.