Resident species to the UK Shelducks are found mainly in coastal areas, although they can also be found around inland waters such as reservoirs and gravel workings. They feed on a diet of invertebrates, small shellfish and aquatic snails.
It is larger than a mallard but smaller than a goose. Sexes are similar but the male has a prominent red knob at the top of his bill. This is absent in the female who also has a white patch around the base of its bill and face. Shelducks nest either in dense vegetation or in old rabbit burrows.