Marginal Revolution has the numbers:

Number of birds killed by the BP oil spill: at least 2,188 and counting.
Number of birds killed by wind farms: 10,000-40,000 annually.
Number of birds killed by cars: 80 million annually.
Number of birds killed by cats: Hundreds of millions to 1 billion annually.

And here in New York City . . .

Local residents and politicians, including state Sen. Eric Adams and former Parks Commissioner Henry Stern, are up in arms over news that the US Department of Agriculture swooped in, rounded up 400 Canada geese in Prospect Park and took them to be gassed.

NYC is gassing the geese to protect airline passengers and hopefully will eclipse BP in the bird-body count in the near future.