S/he just popped in out of nowhere into our suburban back yard (granted our development surrounded on 3 sides by farm lands). Not sure if its a Coopers Hawk or Red Tailed. Any ideas?
It was definitely not a Red Tail - the bird's tail in your picture has black bands on it.
I would guess either a Sharp Shin or a Coopers Hawk. The Coopers Hawk seems to be more common!
Keep your eyes peeled and your camera handy - if you could get a picture of it's whole tail or a flight picture you could know for sure much more easily!