I may be a nutty hippie playing back to nature, but when I had a chick hatch last week with a deformed skull, cross beak, and only one eye, which was sideways on its head, I cut off its head with my sharpest knife. Quickest way I have found. It was the 3rd chick I've had to cull in the last couple years since I got chickens. They are not children that I can take to doctors and therapists to help them overcome any problems they are born with. They are chickens. And I got my chickens for food. I would rather cull it that watch it get picked on during its likely to be short life. Even if there was a vet locally who would put them down, which I couldn't tell you if there is or isn't, I would never pay that kind of money to euthanize a bird I can replace for a few bucks. I don't think I could do the freezer thing. It doesn't sound very humane to me, but I am a mammal, not a bird. I'd have to talk to someone who knows more about bird biology before I could make judgment. But I know cutting of the head with a sharp knife is quick and relatively painless, so I'll stick with that.