I have a pair of Call Ducks (about 4 months old) that live in the chicken coop and run with a bunch of chickens and guinea hens. The last week or so after the sun goes down the ducks fly over the run and into the yard. I have to go out there and corral them back into the coop. If I didn't corral them they would happily spend the night somewhere in the yard. Which isn't safe. I'm wondering if anyone knows why they would do this. Do you think if I build them a small house inside the chicken coop they will be more likely to sleep in there? I know covering the run will keep them inside, but I want the guinea hens to be able to get in and out as they please. Thanks for the help!