What potential harm to the environment does wind energy cause?

wind turbines kill birds and and other flying animals like:
eagles,
raptors,
hawks,
migrating birds and,
bats.

This is an eagle that was flying and died wondering what hit him

http://www.cleanimagesearch.com/media/action/gi/searchhttp://www.cleanimagesearch.com/media/action/gi/search

http://www.cleanimagesearch.com/media/action/gi/search