The owl that decimated my flocks earlier (7 birds!!!) was a barred owl, a smallish but aggressive and territorial owl, which is an invasive species here and known for driving out other native owl species. It was only a few pounds actually, and had a tiny body under the many fluffy feathers. Nothing that goes on a wanton killing spree like that is allowed to stay here though. I wouldn’t underestimate the hawk, even if they are small. I’ve had a few Hawk stoops, all smaller sharp shinned or Cooper’s hawks (I think... ID’s are hard when they dive that fast) but thankfully my Roosters have been alert, and they aren’t those scary crazy goshawks! As in they didn’t dive under or through the cover my flock was using.Well, I had a very large owl hanging out in the trees around my chicken run, and after a lot of scrutiny, she decided it wasn't worth it. I also always knew she was there because the chickens alerted me. No one here has had an owl attack. Only the bald eagles and golden eagles. Our hawks are too small.