Mallards prefer fresh water to saltwater. This is where they search for their food by dabbling, a process involving running their beak over the bottom to find food. Ducks feed on snails, slugs, worms, insects, crayfish and the Tubifex (a round worm that lives in the mud at the bottom of rivers). They also eat water plants, grass, duckweed, acorns, legumes and grain. These ducks feed at night; they leave their resting places (usually larger ponds or river tributaries) as the sun goes down and then enter nearby fields.
Breast of duck has long been a favourite kind of meat.