I was walking along the canal today....ours is quite picturesque with barges, lots of reedy plants and duckies with their ducklings etc. There have always been a pair of swans on the canal...as long as I've lived here (most of my life) I remember seeing them....well today I heard an awful noise as I walked and I saw this swan shoving through some reeds on the other side of the canal and this duck freaking out...and the swan put it's head into the reeds and came out with a tiny, wriggling ducklng in it's beak! 
It has STOLEN it from the nest and the poor thing was wriggling and the Mother was freaking and the swan dipped it into the water over and over and drowned it.
I walked away but lots of people stood and stared in shock...and when I looked back it had it's horrible big swanny neck and head stuck BACK IN the reeds and was after another one to drown.
WHY did it do this? They don't eat meat do they? Was it after the nsting spot or something?
It really disturbed me.