Feeding the foxes will only draw them to the area and increase the chances that they will get the eggs. Because we are not familiar with your laws regarding the protection of the mute swans in your area, we would suggest that you contact Ms. Wendy Hermon at the Swan Lifeline Rescue Facility in Eton, England. Wendy and her staff do a wonderful job of protecting and rescuing swans and she may be able to advise you on the best practices for your area. The Regal Swan