Hi there, I have 3 ducklings and 4 chicks in 2 separate pens. Right now I have one of the ducklings (2 weeks old) with the 4 chicks. The other 2 ducklings (1 week old) are in their own pen. When I tried introducing the older duckling to the other 2, the older one started biting at the younger ones wings and backs and cornering them while doing that. So I put her back in with the chicks. Is it normal for there to be dominance issues with ducklings? I'm new to the duckling thing. (Also side note- the older duckling had a companion initially but she died right away which is why she is with the chicks now, I didn't know if keeping a duckling by itself in its own pen was cruel or not. I just figured it would get lonely). Should I continue to keep them separated or put the older duckling in with its own kind? Thanks in advance!