I picked man because I could only choose one. I think humans 1) treat most chickens the worst, and 2) kill the most chickens, both intentionally and unintentionally.
If I could pick several, I would probably go 1)bear 2)raccoon 3)mink/weasel 4)hawk 5)fox.
I have lost the most chickens to foxes and hawks. I have foxes all over my area and if I get home late or don't close the door well enough, my chickens have a high chance of being dead. They always kill a bunch at once, then only take one or two away to eat.
I think hawks have taken the most of my birds (probably 4 or 5 over the years). They are a tough daytime predator to defend against on a large free-range property. I can't put net over two acres. Every time I lock them up they form little picket lines at their fence and start clucking "Give us liberty or give us death!"
Raccoons and minks/weasels, from what I've read, kill the most birds. The problem with both these predators is that they will kill entire flocks in a night, and both can get in coops that the average person thinks are secure, until they come out to find dozens of birds dead. I haven't had this happen to me, mostly because I've learned from other people on here.
Bears are the scariest. When I lived up north they got into everything. Few coops can stand up to a bear attack, and they can come day or night. I'm not scared to chase of other predators, but bears scare the crap out of me.
a while back we had one struck by lightning and all the feathers in a line from its head to butt were missing!
