Ducks don't particularly like nesting around them:
One nesting site had a 56-percent lower breeding pair density than a similar site with no wind turbines. Overall, the number of breeding ducks using wetlands near the wind farms was 20 percent lower than in wetlands with no wind development nearby.
But on the other hand, they will if they have to.
In even better news, turbines don't kill too many of them during breeding season:
“Females get involved in some pretty territorial courtship flights and we hypothesized that they tend to be less aware of their surroundings during this period. Basically, we wanted to know if they were vulnerable to flying into the path of a turbine blade,” says [Tanner] Gue. “Because female survival during the breeding season is a strong population driver, we focused on females.”
Of the 165 birds marked, just one mallard died after being struck by a blade. Gue and fellow researchers also monitored 145 teal and mallards on a nearby site that did not have windmills.
“We wanted to compare overall mortality rates to see if wind development might lead to higher rates of predation. It turned out mortality rates were pretty similar,” he says.
So there you have it.