I have 5 6 week old chicks, and was wondering if it is ok to let ducks live in the coop and run with the chickens? Also, when do I need to introduce the ducks? I have some friends who have ducks in their yards with the chickens, and they seem to get along fine, so I would think they would be fine in a coop and run. Also, do ducks roost like chickens? Or will they sleep on the ground? Thanks in advance!