Excellent. Seems you have a great habitat for the swans, especially a nice safe place for them at night. The birds just may not be ready to mate at this time. Give it a little time. Once the hormones start flowing, you will have no control and wish you were back at this time of their lives. These swans will breed twice a year, producing 1-5 cygnets a year. So, there really is no rush, in time you will have little cygnets running around, probably more than you ever dreamed!!!! Enjoy! The Regal Swan