Inhabitat:

Naysayers like to point to wind turbines as brutal bird-killing machines, wiping out huge populations of birds, but new research sheds some new light on the controversy. According to a massive study supported by the American Wind Wildlife Institute, wind turbines account for around 214,000 – 368,000 deaths each year.

The neighborhood cat causes far more damage to bird populations, with cats killing 1.4 to 3.7 billion birds each year.