Harryshoe's image is an adult Cooper's. You are correct, kathy9norcal. Note the tubular chest, thick legs, squared head, "Roman" nose, and eyes that are set back from the bill. Tail tip is an unreliable markon a perched bird (so I have learned through experience) due to feather position/wear. Also, on your Cooper's, second pic down- this adult bird has a pale nape to the neck. That is a good mark for a Cooper's. An adult Sharp-shinned has a dark nape of the neck that makes the Sharpies appear "hooded" rather than "capped". Cooper's appear capped.

These guys are very sneaky in my yard. The only time I see them is when they are leaving one of my trees. I have yet to spot one while it`s perched in my trees. Very nice photo!

It looks from here to be a juvenile Cooper's Hawk, as already stated. The tail on Accipiters is long with wide bands, and this bird has that. As for the differences between Accipiters, juvenile Cooper's Hawks have fine brown chest streaks that usually come short of the belly, and this bird has that. So, good call.

This is absolutely an adult Cooper's Hawk with the dark "capped" appearance to the head and also the grey auriculars (cheeks). Tails really cannot be assessed from the dorsal view (Cooper's show graduated lengths and Sharp-shinned show even lengths, but this is best assessed from the underside of the tail). Sharp-shinned Hawks do not show grey cheeks, either. The grey cheeks are exclusive to adult male Cooper's Hawks, and the very bluish slate colored back and wings further support male (female adult Coops are duller).