"Your bird in the photo is a bit strange, and overall I think that it looks like a transition between an immature and adult Cooper's Hawk. Cooper's Hawks have proportionally longer tails than falcons, and your bird has quite a long tail. The one odd feature of your bird is the dark line running downward from below the eye, which is characteristic of falcons. However, Merlins and Peregrines have very dark eyes, and your bird has a yellow eye like that of an immature Cooper's Hawk. Merlins are not found in Tucson during the summer (only in the winter), but Peregrines are rare year-round residents. Cooper's Hawks are common here in Tucson, and they nest in riparian areas."On Friday morning, when it was pouring with rain, we saw the pair flying again. We watched one of the hawks land in a mesquite tree behind our property, spreading its beautifully banded wings and tail. It was a magnificent sight to see through binoculars, but not one I could photograph through the branches. However, I found a beautiful photo of a Cooper's Hawk in flight by Jim Zipp that shows just what it looked like. The pair hung out for a couple of days in the tall eucalyptus across the street.
The conservation status of Cooper's Hawks is described on Cornell's All About Birds web site:
Declines of the Cooper's Hawk in the late 1940s and 1950s were blamed on DDT and pesticide contamination. Populations started increasing in the late 1960s, but it is still listed as threatened or of special concern in a number of states. Appears to be adapting to breeding in urban areas, which may help increase populations. Project FeederWatch data indicate stable or increasing numbers over the last 15 years.