With hen only flocks be targeted, pen them up. Sometimes the Coopers are migrants so will move on if not getting something while working a local circuit. Here I have migrants (juveniles mostly) in fall and spring with adults being local year round. They hunt songbirds right through pens and free-ranging flocks daily but do not target chickens as roosters even though not able to get at hawk scare it.
hes been hanging around all day coming back down and watching my birds