Hey Vendzilla, this is for you.
Main cause of death to birds:
Man-made structure/technology
Associated bird deaths per year (U.S.)
Feral and domestic cats : Hundreds of millions [source: AWEA]
Power lines: 130 million -- 174 million [source: AWEA]
Windows (residential and commercial): 100 million -- 1 billion [source: TreeHugger]
Pesticides: 70 million [source: AWEA]
Automobiles: 60 million -- 80 million [source: AWEA]
Lighted communication towers: 40 million -- 50 million [source: AWEA]
Wind turbines: 10,000 -- 40,000 [source: ABC]
Source :
http://science.howstuffworks.com/env...kill-birds.htm