DunlinCalidris alpinaHvor og når du kan se dem

The Dunlin is a small coastal wader with dark legs and a slightly downcurved bill. In breeding plumage its black belly is conspicuous; outside that plumage, grey and brown upperparts contrast with a pale underside. It belongs to the sandpiper family and is especially associated with exposed tidal feeding grounds. Large winter flocks can be an impressive sight, but their presence depends on suitable feeding and resting habitat. A river cruise can provide access to a nearby viewing area, but the boat itinerary and the wildlife site are not interchangeable. Check whether the relevant shore visit is actually included and whether there is time for patient observation. Historical occurrence is useful context rather than a promise of a present-day encounter. A local guide can help interpret recent records and distinguish similar birds without pushing closer to them.

Size

Species-specific size not verified in the consulted source text

Weight

Species-specific weight not verified

Lifespan

Species-specific lifespan not verified

Status

See sourced assessment

Winter feeding flocks sometimes number thousands. As the tide rises, birds leave submerged feeding grounds and gather on nearby shorelines, saltmarsh or fields. The RSPB describes winter populations in Britain being augmented by birds breeding farther north. Some arriving birds still retain black belly feathers from breeding plumage. These movements explain changing plumage and flock composition, rather than establishing a migration timetable for the Seine. Watch a complete sequence from a settled position: movement, pauses, reactions to neighbours and changes as water conditions alter. A brief view can be enough to appreciate the bird without interrupting its activity. Do not provoke flight for a photograph or use calls to attract attention. Keep other visitors informed if birds are resting nearby, and allow space for natural feeding and retreat. Local disturbance and tide can change what is visible during a single visit.

• The breeding plumage includes a black belly patch.
• The bill curves slightly downwards.
• The legs are black.
• Winter flocks can contain thousands of birds.
• High tides move birds off feeding mudflats.
• Saltmarsh and shorelines can provide resting habitat.
• A white wing stripe is visible in flight.
• Winter birds can retain traces of breeding belly feathers.
• The RSPB reports a British Red List designation dating from 2021.

The registered Seine evidence identifies winter use of the lower estuary. It comes from the protected-site monitoring context covering 2015–2018, not a current sighting bulletin. Winter is therefore a useful qualitative description, not a precise booking calendar. British late-summer-to-spring occurrence described by the RSPB must not be treated as a Seine-specific monthly forecast. Tide, disturbance and access are important alongside the broad season. For planning, ask about recent observations at the exact site, the tide during the available visit and any seasonal closures. A comfortable sailing season is not automatically the best wildlife season. Protected-site records describe occurrence within a particular geographical and historical context, not daily visibility. Keep flexibility in the shore programme and accept that an appropriate visit can still produce no sighting. Local weather, water conditions and disturbance may matter as much as the broad time of year.

Tidal mudflats are the central habitat in this river profile. Falling water exposes feeding surfaces, while the high tide pushes birds towards safer resting places. Bays, estuaries, saltmarsh edges and adjacent shorelines form a connected habitat system. A broad river channel without exposed feeding ground is not equivalent habitat. On the Seine, the relevant setting is the lower tidal estuary and its protected flats, rather than the freshwater banks through Paris. Suitable habitat is only one part of a responsible visit. Access must also be lawful, safe and compatible with reserve management. Remain on established paths or in public observation facilities, and do not cross mud, dunes or protected shore to shorten the viewing distance. Consult current access notices before setting out. The presence of a wetland on a map does not show whether it is open, visible from a cruise deck or suitable for an unsupervised landing.

Dunlins seek small animal prey in wet coastal sediments, using their bills to explore feeding surfaces. Mud exposed by a falling tide provides access to food that is unavailable beneath deeper water. The RSPB specifically links the species to feeding areas uncovered as the tide recedes. Feeding flocks should be watched without being displaced: time spent repeatedly flying away from people is time unavailable for feeding or resting. Natural food availability changes with water levels, exposed surfaces and local conditions. Feeding observations are most useful when made quietly over time rather than by following one bird along the shore. Never bait wildlife or throw food from the deck, a path or a hide. If a bird repeatedly stops feeding to watch your group, increase the distance. A telescope or long lens can show natural searching behaviour while leaving the bird access to its preferred feeding and resting space.

Common name

Dunlin

Scientific name

Calidris alpina

Animal group

Birds

Size

Species-specific size not verified in the consulted source text

Weight

Species-specific weight not verified

Lifespan

Species-specific lifespan not verified

Status

RSPB reports UK Red List status from 2021; this is a UK assessment, not a verified current global category.

Identification

Look for a small wader with black legs, a dark, slightly downcurved bill and a seasonal change in belly pattern. The breeding adult has a striking black belly patch; nonbreeding birds look much plainer, with brown-grey upperparts and pale underparts. Aves de Portugal also describes a white wing stripe and a white rump divided by a dark central stripe in flight. Use several features together rather than relying only on size. Use binoculars first to locate the bird, then a telescope if available to check fine details from the permitted viewpoint. Compare more than one feature, because posture, distance and strong reflections can change its apparent shape and colour. A photograph is helpful only if obtained without disturbing the bird. If important marks remain hidden, leave the identification provisional rather than moving into protected habitat or flushing the bird to force a clearer view.