Common Shelduck (Tadorna tadorna)

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Image of a Common Shelduck in its natural habitat
Birds Shelduck

Introduction

The Common Shelduck, Tadorna tadorna, is a large, goose-like waterfowl in the family Anatidae. It is recognised by its white body, dark green head and neck, broad chestnut breast band, red bill and pink legs. The species occurs across much of Europe, North Africa and Asia, using coastal wetlands as well as suitable inland waters. (ww.worldbirdnames.org)

Physical Description

Adults measure approximately 58–67 centimetres in length and have a wingspan of about 110–133 centimetres. Their body is mainly white, with a broad chestnut band across the upper breast and shoulders, dark green head and neck, black flight feathers and a dark lower breast and belly pattern. The bill and legs are pink to red.

Males and females are similar in overall plumage, but the male usually has a more prominent red knob at the base of the bill, particularly during the breeding season. Females generally have a smaller or absent knob and may show more white around the face. Juveniles are duller, with less strongly contrasting plumage, a paler face and a less developed bill knob. (ebird.org)

Range and Habitat

The Common Shelduck has a broad distribution across Europe, North Africa and temperate and subtropical parts of Asia. It is strongly associated with coastal habitats, including estuaries, tidal mudflats, lagoons, saltmarshes, sandy shores and shallow bays. It also uses freshwater lakes, reservoirs, rivers and agricultural wetlands, especially during the breeding season or where suitable feeding areas are available.

Many western European birds are resident or make relatively short seasonal movements. Populations in northern and eastern Europe, and many Asian populations, are more migratory and may move south or south-west in winter. Large numbers may also gather at traditional moulting sites after breeding. In Britain, the species has expanded into some inland breeding areas, including farmland, reservoirs and river valleys. (bto.org)

Behaviour and Diet

Common Shelducks are generally diurnal and are often seen walking, grazing, swimming or feeding in shallow water. They are social outside the breeding season and may form large flocks on estuaries and coastal wetlands.

Their diet consists mainly of small aquatic and intertidal invertebrates, including mud snails, other molluscs, crustaceans, worms and aquatic insects. They also take algae, seeds, leaves and other plant material when available. On mudflats, they feed by dabbling, head-dipping and moving the bill through soft sediment in a sieving or scything action. The mud snail Hydrobia ulvae can be an important food item in some estuaries. (tidsskrift.dk)

Breeding pairs commonly form long-term associations. The species is usually single-brooded, with breeding taking place in spring and early summer. Nests are often located in rabbit burrows, other animal holes, cavities, caves, cliffs or similar sheltered sites rather than in exposed vegetation. A typical clutch contains about 8–10 eggs, although larger and smaller clutches occur. The female performs most incubation, which usually lasts about 29–31 days. (bto.org)

The young are precocial and leave the nest soon after hatching. Ducklings from different broods may join communal groups known as crèches. These groups can be accompanied by a small number of adults, while some parents leave the young to feed or moult. (onlinelibrary.wiley.com)

Identification Tips

  • Look for a large, stocky duck with a goose-like shape and a relatively long neck.
  • Adults show a strong combination of white, black, chestnut and glossy dark green.
  • The bright red or pink bill is distinctive, and breeding males usually have a noticeable knob at its base.
  • In flight, the broad white wing panels contrast with dark flight feathers.
  • Common Shelducks are often seen walking or grazing on mudflats and grassy margins rather than remaining constantly on open water.
  • Juveniles are browner and duller, with less obvious chestnut and green colouration.

The Common Shelduck may be confused with other large shelducks, but its combination of a white body, chestnut breast band, dark green head and red bill is distinctive within most of its range. The Ruddy Shelduck, Tadorna ferruginea, is mainly rich orange-brown overall and lacks the Common Shelduck’s strongly contrasting white body pattern.

Conservation Status

The Common Shelduck is currently assessed as Least Concern on the IUCN Red List. Its wide distribution and generally large populations mean that it is not considered globally threatened, although status and trends vary between regions. (unep-aewa.org)

Important local pressures include the loss or degradation of estuaries, mudflats, saltmarshes and other wetlands; pollution; disturbance at breeding, feeding and moulting sites; reduced availability of intertidal prey; and unsustainable hunting in some areas. Climate change may also affect coastal habitats, prey availability and the timing or location of migration. Conservation measures include protecting wetlands, maintaining undisturbed nesting and roosting areas, managing hunting sustainably, and monitoring important breeding, wintering and moulting sites.

Frequently Asked Questions

Where does the Common Shelduck live?

It occurs across Europe, North Africa and much of temperate and subtropical Asia. It is most common in coastal wetlands such as estuaries, mudflats, lagoons and saltmarshes, but also breeds or winters on suitable inland waters.

What does the Common Shelduck eat?

It mainly eats small invertebrates, including mud snails, molluscs, crustaceans, worms and aquatic insects. Algae, seeds and other plant material may also form part of the diet.

How can the Common Shelduck be identified?

Adults are large and goose-like, with a white body, dark green head and neck, chestnut breast band, dark wing feathers and a bright red or pink bill. The male usually has a prominent bill knob during the breeding season.

Where does the Common Shelduck nest?

It commonly nests in rabbit burrows and other animal holes, but may also use cavities, caves, cliffs and other sheltered sites. The nest is usually close to suitable feeding habitat.

Do Common Shelducks migrate?

Movement varies by population. Many western European birds are resident or move short distances, while northern, eastern European and Asian populations may migrate south or south-west in winter. Birds may also travel to traditional moulting areas after breeding.

What is a Common Shelduck crèche?

A crèche is a communal group of ducklings from several broods. The young may be accompanied by only a few adults, allowing other parents to feed, moult or rest.

References

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