I agree with all except the predator part in the winter. Winter time predatation around here is horrible. The predators have a harder time finding food, meaning I'm killing more predators trying to kill my chickens.Their feathers are sufficient for staying warm and some fat, but not excessive. I don't believe that types of feed(more corn) can keep a chicken warm, though being too underfed can certainly compromise their ability to keep warm and to stay healthy. Wild birds survive those temps and they are burning fuel due to having to find food, so I think the chickens have a big advantage in that regard. Their foods and water are provided, they have good shelter and they do not have to evade predators...life is good as a chicken in the winter months.
Dead predator count so far since March of this year 16 raccoons, 3 possum, 3 weasels (thanks to my cat) , 2 foxes and a bobcat. I didn't start counting until March.....