I have a large fence dam twelf month ago I purchase three black swans 2 felmale & a male then six month later I purchase a pair of white mute swans. Black & white swans had no problem with except when it comes feeding the black swans got agrasive with the white swans ,black swans want to feed first,spring season started in Australia and things as change with the white swans being very very agrasive with the black swans they do not want them any were near the dam or any where neer the pen to feed . Would you be able to give me advice on this problem I have with the mute swans

Regards. Paul