Not all hawks are a threat, and not a chickens are vulnerable to hawks that in general are a threat to chickens. The hawk shown, a juvenile female Coopers Hawk, is a threat to chickens that are immature, small as adults, and in flocks lacking large adult male chickens. Keeping chicks / juvenile chickens in covered run with a little size is wise when you are constrained by ordinances on what sex of chickens you can have.
In my setting the Coopers Hawk are assume to watch as they go after smaller birds. They will even on occasion attempt to pick of an American Crow which is reason the latter has animosity directed to hawks. I see such daily and they even go into my barn but the adult chickens, especially the roosters will cause it grievous harm very rapidly if it attacks something on the ground.
Hawks like the Goshawk are a much tougher threat even for adult roosters, Red-tailed hawks can be repelled if not able to stay above adult roosters. Red-shouldered Hawks have never caused trouble I could attribute to them. Sharp-shinned Hawk, very similar although much smaller than Coopers Hawk, causes similar reaction in my chickens but I have never had them look at more than songbirds.
If your coop or run it too tight, the chicken can panic where the hawk can grab at it through the wire. Make so birds have cover in coop / run to control for impacts of panic That means no corners or things chicken can wedge itself between item and pen wall.
