Red Knot

Identification

The red knot is a medium-sized shorebird, measuring 23–26 cm long with a wingspan of 47–53 cm, making it the third or fourth largest member of the Calidris sandpiper genus. In flight, it is readily identified by its white wing bar, grey rump, and tail. The bird has a typical sandpiper body shape with a small head, short neck, and slightly tapering bill no longer than its head, along with short dark legs that give it a characteristic 'low-slung' appearance when feeding.

Plumage varies seasonally and by subspecies. In winter, the red knot becomes uniformly pale grey across both sexes. During breeding season, it displays mottled grey upperparts with a distinctive cinnamon face, throat, and breast, and a light-coloured rear belly. Among the six recognised subspecies, C. c. canutus, C. c. islandica, and C. c. piersmai are notably darker, while C. c. rufa is the lightest overall. Females in breeding plumage are slightly lighter than males with a less distinct eye-line.

Range & Habitat

The red knot breeds in tundra and Arctic regions across the far north of Canada, Europe, and Russia, displaying a circumpolar distribution during the breeding season. This species is renowned for one of the longest migrations of any landbird, with some individuals travelling more than 14,000 km annually between Arctic breeding grounds and wintering sites. The birds winter at latitudes ranging from 60° N in the Shetland Islands to 55° S in Tierra del Fuego, with different subspecies following distinct migration routes and wintering grounds across coastal areas worldwide.

North American breeders migrate to coastal regions in Europe and South America, while Eurasian populations winter in Africa, Papua New Guinea, Australia, and New Zealand. During migration and wintering periods, birds restrict themselves to intertidal and coastal habitats. In west Africa, wintering birds have been observed limiting their daily foraging to ranges of just 2–16 km² of intertidal area, while in temperate regions such as the Wadden Sea, they may forage across 800 km² during the course of a week.

Behaviour & Diet

The red knot forms enormous flocks when not breeding, though when foraging singly they rarely call. In flight or when migrating in groups, they produce low monosyllabic call notes. This species is notably long-lived for its size, with recorded individuals surviving over 25 years in the wild.

Diet varies seasonally according to location. At breeding grounds in the Arctic, red knots prefer arthropods and larvae, switching to various hard-shelled molluscs at other feeding sites during migration and wintering periods. Their feeding behaviour is adapted to their coastal habitats, with birds either maintaining a restricted foraging range for extended periods or changing roost sites and moving across larger feeding areas depending on local conditions.

Best Time & Places to See It

The red knot is best observed during migration periods and in wintering areas along coastal regions worldwide. Key wintering locations include western and southern Africa, eastern Australia and New Zealand, and parts of South America. In Europe, the Wadden Sea is a particularly productive location. Spring and autumn migration seasons offer excellent opportunities to observe large flocks of red knots congregating at coastal staging areas before and after their arduous journeys between the Arctic and southern hemispheres.

Photography Tips

Photographing red knots is most productive at high tide roosts where large flocks congregate, or during migration when birds are concentrated at coastal feeding and staging areas. The white wing bar, grey rump, and tail are most visible in flight photographs. To capture the characteristic 'low-slung' feeding posture, photograph birds at rest on mudflats or beaches. Seasonal plumage changes offer distinct photographic opportunities: the striking cinnamon face and breast of breeding plumage during spring migration contrasts dramatically with the pale grey winter plumage. Early morning light and high tide periods when birds are concentrated at roosts provide optimal conditions for flock photography.