Last week I discovered why the ducks may have survived so long. As I was coming home one day I saw a neighbour sitting on his front doorstep, surrounded by ducks, feeding them.
Despite that, this evening there were only nine ducks in the pond (it was too dark to photograph them, but we counted carefully).
Maybe two have learned to fly, and gone elsewhere? Maybe a cat, or a car? Maybe an early Christmas lunch being prepared? Who knows?