We had an intruder in the yard the other day. A Sharp-shinned Hawk attacked one of our resident songbirds and flew off with it. I captured the above photo when he returned a short while later. Needless to say, the yard was dead silent and devoid of songbirds for at least an hour thereafter. Hawks need to eat too, and I understand about trophic cascades, but I’d prefer that he finds another yard in which to hunt.
About Sharp-shinned Hawks (from the Audubon Field Guide):
The smallest of our bird-hunting Accipiter hawks, this one is also the most migratory, breeding north to treeline in Alaska and Canada and wintering south to Panama. It is during migration that the Sharp-shin is most likely to be seen in numbers, with dozens or even hundreds passing at some favored points on coastlines, lake shores, and mountain ridges. At other seasons the hawks lurk in the woods, ambushing songbirds and generally staying out of sight.