I had white pekins a few years ago that did just what was said above, they came in at night on their own... never had a problem. I have a shallow stream by my house that pools up into a very small pond in one place where the 3 white pekins I have now like to hang out. In the fall, they started wanting to stay out at night. We did everything to get them in, and they just would not come in. After several hours, they did finally come in with the food bribe. That happened several nights this past fall. Then one night, they were stubbornly staying out, I know they think they're safe on the water, but the water is so shallow... And we were going through the stages of trying to get them in... out for awhile, in the house to wait for awhile, out for awhile... etc. I went out on the deck, to go down the stairs to try again, and right then, I heard one of the ducks thrashing in the water and screaming. I ran out there, scaring off what I think was a fisher cat, and spent an hour trying to get her to the bank so I could take her in and care for her. (she recovered fine, but was badly wounded) So, after that, we would put the ducks in really early, an hour or so before dusk. They hang around the yard, go down to the stream, back up in the yard, and they always come for treats, (except at night). So we started herding them in before dusk. They share space in the henhouse, and we have double doors, so we close the bottom ones on the ducks and leave the top ones open for the chickens to get in when they're ready. The ducks just stand in there and yell their heads off! They're so mad they're locked in early! We love having the ducks, and would have them even if we knew we'd have to go through all of this. And like I said, the first ducks we had a few years ago never did that! They always came in! So, just know that it doesn't always work the way it's supposed to... when you have a stream close to the house, but there are ways to deal with it.