Birds Active day and night

Common Shelduck

Tadorna tadorna

iNaturalist eBird Wikipedia

With its striking piebald plumage and bright red bill, the Common Shelduck is a majestic sight on coastal mudflats. Often described as a 'half-duck, half-goose,' this colorful waterfowl is a master of the intertidal zone.

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Quick Identification

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Size

Length: 58–67 cm (23–26 in); Wingspan: 110–133 cm (43–52 in); Weight: 800–1,500 g (1.8–3.3 lb)

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Colors

Striking piebald appearance with a white body, dark green (appearing black) head, and a broad chestnut band across the chest. Bills are bright red; males feature a prominent fleshy knob at the base during the breeding season.

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Key Features

Bright red bill with a prominent knob on breeding males
Broad chestnut-colored band across the white chest
Dark green, almost black-looking head and neck
Large, goose-like silhouette compared to typical ducks

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Variable based on tides; most active 2 hours before and after low tide.

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Season Year-round in coastal areas; March-July for breeding.

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Diet Mainly feeds on small invertebrates, particularly Hydrobia snails, found by sifting through mud with its bill. Also eats small crustaceans, insects, and occasionally aquatic plants.

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Habitat Coastal estuaries, salt marshes, and mudflats; occasionally found on inland lakes or large reservoirs during breeding.

Behavior

The Common Shelduck is a fascinating, goose-like duck often seen patrolling mudflats and estuaries. They are highly social, especially during the molting season when thousands gather at specific sites, such as the Wadden Sea in Germany. Unlike many ducks, shelducks are monogamous and tend to return to the same nesting sites year after year, often forming long-term pair bonds.

One of their most unique social behaviors is the formation of 'crèches.' After the eggs hatch, adult pairs often leave their young in the care of a few 'babysitter' adults, allowing the biological parents to migrate early to traditional molting grounds. While they are generally wary of humans, they can become accustomed to presence in areas with high foot traffic near coastal paths, provided they aren't directly disturbed.

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Camera Tips

Capturing the Common Shelduck on camera requires an understanding of the tides. Since these birds feed primarily on mudflats exposed by receding water, place your camera on a sturdy tripod or stake at the high-tide line, angled slightly downward toward the mud. Ensure your equipment is waterproof and secured against salt spray, as coastal environments are harsh. A wide-angle lens is excellent for capturing the flocking behavior, while a telephoto setup is better for identifying individual bill markings.

If you are near a breeding site, look for rabbit burrows or dense vegetation near the shoreline, as shelducks are famous for nesting underground. Position your camera about 5-10 feet away from a suspected burrow entrance, setting it to 'Burst Mode' to capture the quick entry and exit of the parents. Because they are active according to the tide rather than just the sun, ensure your camera has high-quality infrared night vision to catch nocturnal foraging sessions.

While baiting isn't usually effective for shelducks due to their specialized diet of mud-dwelling snails, you can increase your chances by scouting for 'loafing' spots. These are flat, sandy areas or grassy banks where the birds rest and preen during high tide. Setting your camera to a 30-second video trigger with a short cooldown will help you record their complex social interactions and preening rituals without filling your SD card with hours of empty footage.

Similar Species

Species that look similar or are commonly confused with Common Shelduck.

Ruddy Shelduck

The Ruddy Shelduck is almost entirely orange-brown (cinnamon) in color, lacking the white body and green head of the Common Shelduck.

Northern Shoveler

While also having a green head and chestnut flanks, the Shoveler has a much larger, spatulate black bill and is significantly smaller in size.

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Frequently Asked Questions

Common Shelduck activity is governed more by the tide than the time of day. They are most active during low tide when mudflats are exposed, providing access to their favorite snails and invertebrates, whether that occurs during the day or night.

Unless your backyard includes a coastal salt marsh or a very large lake with mudflats, it is difficult to attract them. However, if you live on the coast, maintaining natural shoreline vegetation and avoiding the use of pesticides can help preserve the invertebrate populations they depend on.

Their diet is almost entirely composed of small saltwater snails (especially Hydrobia), crustaceans, and marine worms. They use a side-to-side 'scything' motion with their bills to filter these tiny creatures out of the soft mud.

They are generally not found in typical suburban gardens. They are specialists of estuaries and coastal wetlands, though they may occasionally visit large suburban parks that feature expansive lakes or reservoirs near the coast.

Look for the unique combination of a bright red bill, a dark green head, and a distinct chestnut-colored chest band on a mostly white body. Their large size and upright, goose-like stance also distinguish them from smaller 'dabbling' ducks like Mallards.

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