Cooper's hawk Accipiter cooperii
I came across a
nice article by Paul Smith in the Racine Wisconsin The Journal Times. He talks about the Cooper's Hawk.
The Coopers Hawk, which is a medium sized
accipiter(latin for "true hawk"). Cooper's Hawks have almost identical plumage to the Sharp-shinned Hawk, however they are larger than the Sharp-shinned hawk. Coopers Hawks are quick and extremely agile. Passerines or songbirds end up being dinner for the Coopers hawk.
For more information on the Cooper's Hawk