^ Wow that is awesome footage. I know birds are extremely agile, but it would be interesting to watch a highly experienced quadcopter pilot try to repeatedly dodge a hawk!
I've seen videos of stunt R/C helicopters and how quickly they change direction -- I think faster than large birds like a hawk -- but it'd probably also badly injure a bird in an aerial attack. But the blades on a quad are much smaller/safer for some hawk-to-r/c air combat
