Wind farms apparently aren't quite as harmless and "green" as promoters like to say. It appears they may present a threat to eagles and hawks, especially along the Columbia River in Oregon and Washington. ...Wind farms consist of tall windmills with three big blades each. Already they have exacted a price - by altering the view of the barren hillsides where they've been set up. ...But when it comes to birds, the price gets much steeper. It is feared that with hundreds or even thousands of these windmills close together, they could start exacting a heavy toll on large birds that live in those regions as their native habitat. ...If it turns out that the windmills kill large numbers of big raptors, those proud "Blue Sky" signs on people's lawns might well disappear. It's one thing to consume power when the side effects include some air pollution far away or damage to fish at Northwest dams. But to be contributing to the demise of eagles that are batted out of the sky by whirling blades, that would be something else.