This is a Giant Robber Fly(Promachus fitchii) eating a bee.
I was about 20feet away from this little guy when I shot the picture.
My camera was on a monopod, so I shook a little shooting the picture.
Nikon D200
,Nikkor 400mm f/3.5 Ais w/KenkoPro TC-1.4 1/750s f/5 at 560.0mm iso320
full exif