Check out this site:
http://www.currykerlinger.com/studies.htm
All of these studies have been done across the pond; however they demonstrate that wind turbines do not need to cause (many) bird fatalities *IF* care is taken to situate them outside of bird migratory and flight patterns.
I would also argue that generating power using fossil fuels results in *FAR* more bird fatalities. It's just they are indirect deaths caused by pollution, climate changes, etc. and therefore don't have an obvious causal connection to a gas or coal burning plant.
For the record, i'm a major advocate of wind power (in conjunction with a huge reduction in total power consumption) and feel the potential dangers to small numbers of birds (which can be minimised, but probably not eliminated entirely) is outweighed by the benefits.
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