That's true; we fed a couple of swans back in April when we were in Harefield, they followed us all the way to Macclesfield before we finally managed to give them the slip. We thought we had lost them on several occasions but every few days they would be waiting in ambush. The other half says they are different swans but I know they are not. They have the same long necks, bright yellow bills, beady little eyes and a insatiable appetite for bread which they are prepared to mug you for.
Don't feed swans, they are evil, and better trackers than bloodhounds.