Our chickens free range, and occasionally we run errands in town for about an hour and leave them out. We live in bush Alaska, so there is a lot of cover, but also many predators. Bears come by and dig occasionally, until they get shocked by the electric fencing. A coyote once walked right by my chicken coop without looking. The chickens had just gone to roost. We have only lost two chickens to hawks, and that was over 2 years ago. The same hawk was unraveling the wire we had over the top in a grid. Which has since been replaced with netting. We caught a different eagle pulling staples out of where the netting meets the fencing (whole log frame). But we see hawks almost everyday. Around August, a hawk perches on the coop every morning before we let them out. Bald Eagles rarely take anything around here. But there is a nest very close by, and my neighbor had a juvenile eagle dive for her ducks, but the netting saved them.
Yesterday I was gone in the morning for about 20 minutes. When I came back two of my ducks were badly injured, and one was missing. No tracks, no feathers. I do believe I found drag/struggle marks. The ravens have been making a lot of noise and I saw some carrying 'chunks'. My husband and I searched the woods but can't find the body, which I would rather not leave out!
This thread is great and really informative! We hear of weasels killing entire flocks around here. I'm always nervous about how well our coop would keep one out. We've built the run well, but I've heard they are incredibly good at getting in. Now I hear that chicken wire doesn't keep them out!

I'll have to get hardware cloth/ratwire asap). My ducks always sleep outside. My chickens go in the coop. Maybe I should lock the ducks up in the duck coop.
I sure am glad we don't live where there are raccoons anymore. They are hands down the WORST for chickens! In VA, we used a live trap from a biologist and this one raccoon got in AND OUT a few nights in a row. We never actually caught him.