It would have to be lots and lots of fireworks to kill birds. I live in a fireworks legal area, and the one thing you don't notice in those vids are the left-over fireworks garbage that I can sometimes find the day after a holiday. It can look like the remnants of a ticker tape parade.............Nope, no fireworks dunnage at all.
edit on 2-1-2011 by Khaaaaaan!! because: fireworks, meh