Aww good! It looks more like a pekin then aylesbury though. Aylesburies have pink bills. If u could post a picture of the body we could see for sure.
HollyDuckFarmer: the coloration of the ducks is not why they are in that order. It's the size, disposition, temperament, etc. Pekins tend to be shy and easily bullied by small ducks. Tis is probably the case for you as well. You can add more ducks if you would like but it will likely put another duck in the same position as your current pekin. Also, the neck biting etc. can be signs of courtship with ducks, not bullying. My buff boy often bites the necks of my hens in an attempt to court them and get them to let him mate them. The females will also chase other females away from their mate as a sign of ownership over him and makes will do the same to other males attempting to court their females. This could be the case. Does e pekin have a mate or is she attempting to steal another hens or group of hens drake?
HollyDuckFarmer: the coloration of the ducks is not why they are in that order. It's the size, disposition, temperament, etc. Pekins tend to be shy and easily bullied by small ducks. Tis is probably the case for you as well. You can add more ducks if you would like but it will likely put another duck in the same position as your current pekin. Also, the neck biting etc. can be signs of courtship with ducks, not bullying. My buff boy often bites the necks of my hens in an attempt to court them and get them to let him mate them. The females will also chase other females away from their mate as a sign of ownership over him and makes will do the same to other males attempting to court their females. This could be the case. Does e pekin have a mate or is she attempting to steal another hens or group of hens drake?