With pekings you should be great and only need to pen and do all for week unless flighty, or have river ect they could just float away on, as supposedly neighbors who have say they are really lazy once get out of teen phase and rarely range as far as dual purpose chickens at most, but preds are much worse on them like magnets i here (most neighbors who had huge flocks free ranging now down to one or two at most, maybe cause how loud bright and cumbersome they supposedly get). I'm new to mallard breeds, and haven't had my KC ducklings out yet, and my scovy like puppy dogs.
I whistle a certain tune to call my ducks, pigeons , chickens, dogs, cats, rabbits, and used same for goats, guinea pigs, hookbills/ various parrot types, songbirds, ect that used to have. make any certain noise every time feed and treat ect, then when they come to you/cage and or dish for a week to month straight every day and settle in in evenings, then can let them out of area set up to see surroundings (so they know were to come back to, but don't feed day of or before letting out if flighty and or energetic or they could just bolt to go as far and fast as can. if they are or do, then watch them first couple days when let out to come home time, and call if they get wandering too far first week or so not looking around to surroundings enough to know were to come home to. after week to month they are coming and going all day and return at night on own mostly, and you should be able to leave feed out all day to supplement forage and grazing ect. never do with unfit critters as they may not get enough forage to compensate for lack of feed and vast increase in exercise.
