Quite clearly bread is not a foodstuff that occurs in nature. It is man-made. So why it should be the snack of choice for ducks and swans, or quite how man first came to feed them baked goods, is beyond me.
What I do know is that a trip to the lake, pond, river or large puddle to feed the ducks never fails to entertain. It is therapeutic, relaxing, smile-inducing and just jolly good fun.
It is also an ideal way to dispose of stale bread.