We have 8 mallard ducklings hatched naturally. We removed the drake as he appeared to peck at them in the nest. They are a week old last Sat and today I tried putting the drake in with them. He immediately attacked a duckling so we removed the drake promptly. The drake is in our 10' x 10' chicken run alone (but can see his duck and ducklings in another enclosure near him). Our 9 hens are stuck in our 6' x 4' wooden coop with 2 levels but I'm sure are missing their run. Do I need to keep the gander separate for another 7 weeks until these ducklings begin to feather so I can sell them. (I have already sold 4 but the buyer wants 1 male, 3 females and I can't sex them yet)? Should I try again in a couple of weeks? Any advice is appreciated. Thanks in advance.