I guess I didn't give enough information.
Hopefully I can explain this so it makes sense.
The ducks seem to really like sharing the space with the other birds. The ducks can get into two different coops (as can the chickens). The nights they don't fly out of the run they actually sleep...
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...