ID please

Saw and heard this circling overhead today. I can't really get a lock on its wingspan because I've never been good at estimating that sort of thing. I would guess somewhere around 4 feet, but who knows. Anyway, my best guesses (with help from Sibley) are a couple of different hawks and some sort of kite. None of the pictures are in focus because the thing wouldn't hold still! These shots are with the 300mm telephoto on, and VR turned on.

It wasn't just circling like riding thermals, it was wheeling and diving all over the place. It was pretty cool, only because I know my kitty is too fat to be scooped away by a raptor.