Here’s The Mallard from The Second Ladybird Book of British Birds and their nests:
The Mallard is a common wild duck. Except for being a little smaller, Mallards look and make an ordinary “quack” like farmyard ducks, although the drakes are more splendidly dressed.
Here’s a splendidly dressed drake:
Even if it does have an ordinary quack.
The Mallard lives on big lakes, field ponds or quiet stretches of rivers, and eats frogs, worms, small fish and leaves of water plants
Young Mallards do not like going into water at first and have to be encouraged by their mothers, but as soon as they enter they can swim.
I should hope so.