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.A juvenile Cooper's Hawk is now a regular visitor to our neighbourhood. I usually can tell when it's nearby because I hear the flap of hundreds of wings as all the birds feeding in our patio take off instantly to seek cover.
A couple of weeks ago, as I was getting out of the shower, I saw this beauty on the telephone wire right outside our bedroom window. I ran for the camera - no time to dry off - and took photos through the window. (The fuzzy blobs in the back are doves on the power lines behind our house. The hawk doesn't go after them if they're stationary.)
The Cooper's Hawk flew to the patio wall and waited. It spotted its prospective prey and took off.
It took off in a flash. My next photo was of a blank wall. He disappeared from my view, so I don't know if his hunt was successful.
Another Cooper's Hawk flew into the yard last week and spent some time hunting finches (unsuccessfully) in a small xylosma bush.
Unfortunately, I couldn't get close enough for a decent photo, but these show its fantastic red eyes and dark grey back, indicating it's an adult. (Juvenile Cooper's Hawks have brown backs and golden eyes.) It wasn't until I processed the photo that I noticed that this hawk's been banded.