I have 2 mallards and 3 runners that are 2 months old. About a week ago I moved them from the chick coop to the grown up coop w/ my chickens and guineas. They decided to stay inside for 3 days ( their choice) and then on the 4th and 5th day when they came out they would go in the chick coop and hang out w/ the 2 month old chicks who are now free ranging (doing very well) so at night I would walk them back in w/o much fuss and lock them up for the night. Tonight they went in all on their own. It was such a suprise w/ them being this young and knowing most ducks are harder to coop train. So for any newbie duck owners, dont give up, it is possible.