We were fair taken with this little group of pure white ducks, which I had assumed to be domestic escapees - white mallards. These are not uncommon in town ponds especially near farms. But a little googling confused me, as domestic ducks are apparently larger than wild ones - and these were significantly smaller. Could they be set of just-fledged young? But a family would presumably be a domestic/wild cross and wouldn't normally all have the recessive white gene. Also, I think these are all females. Any duck experts are welcome to explain.
Incidentally, white ducks produce the adorable golden ducklings of story-books. I think these are quite pretty in their grown-up feathers too.