Hi there thank you for your last email reply, we are half way throw winter in Australia and I desided to purchase a extra male for one of two felmale so there be a pair of each. When I put the new male with the other three black swans with (one male and two felmale ) the two & half year old male that I have is very agrasive to the new male, I did devided the dam in to two half so the white muite swans stop being agrasive to the black swans, your advice be very helpful.
Best regards
Paul