me and our lass saw one a couple of years ago at the pond near the sash at grimey,it had had its breast removed,which points to the possibility that someone had killed it to eat it.
Been speaking wi a couple of noddies who fish it. They are finding baited handlines up and down the bank so it appears the swans have got caught up in them.
No idea what it's actually like but a swan looks pretty tasty; I'd definitely try a drumstick if offered