Mallard hybrid, with "normal" Mallard inset for reference

The typical white "bib" on the chest (above and below) indicates a Mallard cross with a white domestic duck of Mallard-type stock

The surprising feature here is not the male hybrid's bib or side but the dark female with patches of shiny green head

A conventional Mallard for reference

Her ducklings don't have the conventional eye-stripe of Mallard ducklings

Click above for hybrids of Mallards and Mallard-descended domestic ducks in a domestic situation

(ie non-wild/feral such as farmyard)

Click above for Mallard-descended domestic ducks