Hi, I have a mum and dad swan and 5 signets that are about 7 months old. They live in the sea at the bottom of the garden but come up to the garden to rest etc. Mummy swan has started falling over, a lot. I saw her tumble over some rocks a few days ago but I feed them out of a bucket and the last day or so she is really struggling to get out the water and is falling a couple of times every meter or so she waddles. Do you know what this could be or what I can do to help her?. Thanks