I posted a question to you in February about my swans nesting early. They had 5 cygnets and for the 2nd year in a row they all died gradually over a period of 3 weeks. I've read where their lifespan can be very short but 100% 2 years in a row seems steep. Could it be something in our lake ? We have silver perch and carp and of course eels, but I would have thought the cygnets too big for them. Can you advise anything? Many thanks, Adèle