I started with 6 chickens this spring and was considering on adding a duck or two to my flock, but don't know if it is wise to do so. I live in SW Michigan so winters can get cold. Will ducks do well without a heat source? Will a duck go into a chicken coop with the chickens and live peacefully with them? Can I feed a duck the same chicken feed and scratch grains? Is there anything else I am not considering?