I have (had ) 18 ducks. As I got a new group I added a new house for them to sleep in, and they all sort themselves into the same houses each night at Ducky Round-Up, it's so fun to watch. The groups are:
2 Pekin hens
1 Khaki Campbell drake + 3 KC hens
1 KC drake + 2 KC hens
1 KC drake + 7...