Wow! I didn't realize that coopers were as dangerous as I thought red tails would be. We actually had a cooper's hawk swoop down 10 feet from us to grab one of our 11 week old hens yesterday. We have been letting them out in our yard in the evening. We usually hang out there while they are out and thank goodness we were nearby this time. The cooper came down at the edge of the trees and was just a few feet away from a hen when we screamed in shock and jumped out of our chairs. It turned and flew away. It took quite a while to find all the hens that scattered into the bushes and under trees. Now the girls will stay in their fort knox run.