I have 3 hens and a pekin duck. They were raised together. The duck thinks she's a chicken. The chickens go where the duck goes. The duck goes where the chickens go. The duck 'patrols' for the chickens while they sleep. It's just precious to watch them. I can pick up a chicken or the duck and start walking and they all follow cause they are a flock. If the duck could get up into the roosting area of the hutch, she would. I agree, it would be much dirtier. Big poop. When I build a new coop this spring, however, I will make it so the duck can join her flock - dirtier or not. She sleeps under the roosting area now and stands guard. The duck won't go in the pond. The chickens will get their feet wet on the edge of the pond, unlike the duck who won't even step in it. The duck does play in a tub of water and the chickens often roost on the sides while the duck splashes around. In particular, if I go out to the coop in the night during these very cold nights to check on them, there will be Duck-Duck pacing around the heat lamp and her water tub and there with her will be her sidekick, Hazel. Hazel will sleep outside the coop just to be with Duck-Duck. Although, last night when the temps dropped into the single digits, they both were where they were suppose to be and that was not together. I can pick up Hazel and put her back in the roost to sleep and she will come right back down to be with Duck-Duck. Cute, cute, cute....