Good morning! I have a pekin duck who is borderline a jumbo pekin. We recently released them into the run & all members of my flock (13 chickens, 2 ducks - one silver harlequin & a pekin) are able to get back into the coop except my large pekin. We made an longer than normal ramp for him to use with less of a "slope" but he hasn't learned to use it & keeps slamming his breast at the doorway trying to climb in, with no success. Any suggestions on a different method or apparatus to use to help him get back into the coop?