Location: Broward County, FL (Ft Lauderdale area), inland location.
For the past few weeks, I've been getting glimpses of a very dark, medium-sized buteo. It usually hunts just at the top of the tree line and I end up losing it behind the trees after a second or two. On one occasion I was able to catch it soaring (very high) and was able to snap a couple of pictures. The initial impression was Short-tailed Hawk (regularly seen in this area), but after getting it in the binos, it was clearly not.
The attached photo was taken on 4/30/15, unfortunately at some distance. The top is close to how it actually appears to the eye (like I said, very dark), the bottom is lightened and enhanced to show some of the markings. The dark band across the breast would seem to point to RTHA (which are present here), but it lacks the dark petagial marks and otherwise seems not at all like a RTHA. Swainson's perhaps?
TCMysteryHawk by Bruce Pickholtz, on Flickr