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The Mallard is a dabbling duck is commonly found in shallow water around particularly in North America. They are called dabblers because the they eadt in shallow water by tilting their head and reaching for the food as compared to divers who do just that---dive for food underwater. You see a pair here with the male being the one with the green head. Notably these ducks have adapted will to human habitation and frequent public waterways and ponds. Sometimes they are domesticated as pets or raised for food. Also they will cross breed with other species of ducks creating some unique results. The tend to pair off during the breeding cycle in early spring and form large flocks at other times of year.
Additional information: see Wikpedia - Mallard