Hello everyone, we have 2 ducks, a pekin duck that is nearing 2 years old and a muscovy duck whom we believe is now a couple months old. We got the muscovy duckling to accompany our Pekin who is called Lulu (we thought she was female as a baby but now quacks like a male and has a drake feather in its back so we now believe he/she is male) but Lulu will not get along with our Muscovy whom we believe is truly female and is named Rose. Lulu chases Rose around the garden and when she catches her, Lulu uses his/her beack to grap Rose's neck and head almost trying to pin her. Recently, we've also seen Lulu tries to get on top of Rose, and is extremely agressive. This is why we do not let them be without supervision together. Has anyone had a similar problem? What could be causing the agressiveness?