From Christopher Schmidt:
On Oct 8th, I was flying my quadcopter at Magazine Beach Park in Cambridge, when a hawk decided he wasn’t too happy with my invasion of his airspace…
As far as I could tell, the juvenile red-tailed hawk came out unscathed, and having defeated his prey, was happy to retreat. (As soon as he flew at me, I throttled down the props to try to minimize any harm to the bird.) The quadcopter came out unscathed as well.