"With regard to bird fatalities, it says: "Wind turbines represent an insignificant fraction of the total number of bird deaths caused by man-made objects or activities (eg building structures, transmission lines, and keeping domestic cats)." According to the CSE, for every bird killed by a turbine, 5,820, on average, are killed striking buildings, typically glass windows."

https://www.theguardian.com/environment/2012/feb/27/wind-ene...