Well, the arkansas GFP autopsied 15 of the blackbirds that died in Ar. Lol, supposedly died from blunt force trauma after being scared by loud noises. I'm not much of a conspiracy therorist but I sure as hell don't believe that one. I suspect city people will believe that lie but country people sure as hell won't.
Supossedly the noise scared them so bad they flew full speed into the sides of peoples houses, trees, poles, etc. Yet no one has reported any birds banging into their house.
Obviously when a bird falls 500 to 1000 feet it's going to have blunt force trauma when it hits the ground.