More settled science: Maybe the total, all-time, worldwide wind turbine bird kill is 5,000, or maybe the US kill is 275,000 annually

10Q: Vestas Seeks Wind 'On Par' with Nuclear - Bloomberg

How many birds have been killed by wind turbines? Would you say 5,000 birds?

Robert Bryce: Windmills Are Killing Our Birds - WSJ.com

Michael Fry of the American Bird Conservancy estimates that U.S. wind turbines kill between 75,000 and 275,000 birds per year.