The hawk that was on the coop was bluish in color, so I googled it and I am sure that is was a Coopers Hawk. It is not a large hawk, but can kill and eat a chicken. The girls are giving me a piece of their mind right now. Squawking and yelling at me to let them out. I am too tired to right now. We just got home and I am falling asleep. Maybe at 6 pm.