I'm thinking about getting a midget white or two. I know they don't often get over 20lbs, but how big (height, and width) do they get on average? Are you able to keep them with chickens or ducks without issues or would I have to make a new coop for them? Would they be able to free room without issue if we have coyotes at night (working on that issue), or would a larger breed be safer free ranging with coyotes around?