The shelduck (Tadorna tadorna) is a large, colorful duck that is bigger than a mallard but smaller than a goose. Both males and females have a dark green head, a chestnut belly stripe, and a red bill. Shelducks are primarily found in coastal areas, but they also inhabit inland wetlands and estuaries.
These birds nest in burrows, often repurposing old rabbit holes or tree cavities. After breeding, they undergo a complete molt, becoming flightless for about a month. Shelducks feed on small invertebrates, including aquatic snails and shellfish.
Their population has expanded inland over the past 50 years, with breeding sites now found in valley farmlands and reservoirs. In winter, large numbers gather in muddy estuaries and coastal marshes.