Another is how many birds it kills a year. (http://www.smithsonianmag.com/smart-news/how-many-birds-do-w...)
That's not to say we shouldn't build it. Just that we need to consider what it costs before we do.
They do want to avoid building them on busy migration routes though.
Amazingly popular talking point amongst hypocritical fossil fuel industry supporters and semi-professional contrarians though.
All I'm saying is before we decide to build more wind turbines, we should have an honest accounting of all of the benefits and costs laid out. There are locations where they make sense and places where they don't. And there are levels where some government support might make sense, and some levels where they don't.
Even if people support one form of power generation over another, there should always be a limit.