Bird Identifier
Red Knot
Order: Charadriiformes, Family: Scolopacidae

Red Knot

Calidris canutus

A medium-sized, stout sandpiper with a short, dark bill and relatively short, greenish or dark legs. Highly gregarious, often forming large, tightly packed flocks on mudflats.

Explore Red Knot in the encyclopedia →

Identify your own birds.

Get a report just like this from any photo or call, free.

Plumage & appearance

In breeding plumage, it has a distinctive brick-red face and underparts with dark scalloping on the back. Non-breeding adults are plain grey above and whitish below with faint breast streaking. Juveniles have scaly, pale-edged upperparts.

Key field marks

Stout body, medium straight dark bill, greyish upperparts in non-breeding plumage (or brick-red in breeding), and greenish-yellow to dark legs.

Size & weight

Length: 23-25 cm (9-10 in), Wingspan: 47-53 cm (18-21 in), Weight: 100-200 g (3.5-7 oz)

Voice — call & song

A low, soft, musical 'knut' or a rolling, repetitive whistled call given in flight.

Diet & foraging

Invertebrates such as marine worms, small mollusks, and crustaceans. Crushes hard-shelled prey using its muscular gizzard.

Habitat

Coastal marine environments, including intertidal mudflats, sandflats, estuaries, and rocky shores during migration and winter; high Arctic tundra during the breeding season.

Migration & movement

Long-distance migrant, undertaking some of the longest annual migrations of any bird, traveling from high-latitude Arctic breeding grounds to distant southern wintering areas.

Nesting & breeding

Nests on the ground in a shallow scrape lined with leaves and lichens in the high Arctic tundra. Clutch is typically 3-4 eggs, incubated by both parents.

Similar species

Other medium-sized sandpipers, but distinguished from Dunlin by its shorter, straight bill and lack of a down-curved tip, and from Dowitchers by its shorter bill and stockier build.

Ecological significance

Acts as an important predator of intertidal invertebrates and serves as a vital link in the marine food web, particularly famous for its synchronized feeding with horseshoe crab eggs during migration.

Conservation status

IUCN Near Threatened, with populations experiencing significant declines due to habitat loss and reduced food availability at staging areas.

Observation tips

Visit coastal mudflats, estuaries, and sandy beaches during high-tide roosts when flocks gather closely together. Use binoculars or a spotting scope to scan through dense groups.

Interesting facts

The Red Knot is famous for the subspecies Calidris canutus rufa, which undertakes an incredible 9,300-mile migration from the tip of South America to the Canadian Arctic each spring.

More like this

Other order: charadriiformes, family: scolopacidae birds