This is our Cooper Hawk, not mine but one that lives near by our neighborhood. It's been here for several years and yet it may not be seen for long periods of time. I have pictures of it on the neighbors deck, and another neighbors roof. In that one I caught it diving down just over my head and then swooping up in a tree in the front yard where it found a nest of young robins. They're posted in this blog somewhere.
Here it is about twenty feet out back over a bird feeder. It took off between the the houses, maybe it saw the mouse that I have seen signs of in the grass. What a mouser to have.