That's insane... i've seen birds do that on a smaller scale of course, but nothing like that... almost looks fake. Looks like the smoke monster from LOST!
Weird how birds instinctively change course like that in a flock. One of natures cool little mysteries.
???? - pretty obvious really. Very awesome on that size scale! The only thing that would have made it better would of been the mass of them forming shapes and characters at various points of their flight!
