I first saw this video on Birdchick, which is a really cool, down to earth birding blog. I've since watched a couple episodes of the BBC One Earthflight documentary series (which this clip is from) and, holy crow, there are even more amazing shots than this. That being said, this is still pretty awesome. Starling murmurations are one of the most beautiful and awe inspiring things I've ever seen. And, of course, Peregrine Falcons are awesome.