Do wind turbines harm wildlife?

Birds and bats occasionally collide with turbines, as they do with any tall structure. A few older wind projects have raised concerns about bird impacts because they were built in areas with sensitive raptor populations. Careful siting and wildlife studies make it possible to avoid most wildlife problems.

For more information check out these websites:

The National Wind Coordinating Collaborative has a Wildlife Workgroup 

American Wind Energy Association provides a  number of resources