Red Knot

Overview

The Red Knot is a chunky, short-billed, short-legged sandpiper renowned for one of the most extreme long-distance migrations of any bird, with some populations flying nonstop for thousands of kilometers between wintering and staging areas. Its breeding plumage - a warm brick-red wash across the face and underparts - is one of the most striking transformations among shorebirds.

Feathers are most often found at major coastal staging sites where large flocks gather to refuel during migration, as well as on open wintering beaches.

Feather Identification

• Breeding body feathers: warm salmon to brick-red tones across face, neck, and underparts, with upperpart feathers showing rufous and black mottling.
• Nonbreeding body feathers: plain pale gray above with narrow whitish fringes creating a soft, scaly look, and white below - among the plainest plumages of any large sandpiper.
• Size and shape: noticeably larger and stockier than most calidrids, with broader, more robust body feathers reflecting the bird's chunky build.
• Wing feathers: gray-brown with a faint pale wingbar, less bold than in many smaller sandpipers.
• Versus Dunlin/other calidrids: larger overall feather size and a shorter, straighter bill shape (inferred from associated remains) separate Red Knot from smaller calidrids like Dunlin or Curlew Sandpiper.

Plumage Notes

Breeding adults of both sexes show a rich brick-red to salmon wash across the face, neck, and underparts, with mottled rufous-and-black upperparts; females can average slightly duller. Nonbreeding adults become plain scaly gray above and whitish below, losing all trace of red.

Juveniles resemble nonbreeding adults but show a neat, scaly pattern on the upperparts with pale buff fringes and fine dark subterminal marks on each feather. The complete molt to nonbreeding plumage typically occurs after migration, often at wintering grounds, while a partial molt into breeding plumage happens before spring migration.

Habitat & Range

Red Knots breed on high Arctic tundra across northern Canada, Greenland, and Siberia. They are famous long-distance migrants, staging in enormous numbers at key coastal stopover sites, and wintering along ocean coastlines across the Americas, Europe, Africa, and Australasia, with several distinct subspecies following different flyways.

Behavior & Field Notes

Red Knots forage on open mudflats and sandy beaches, often probing for small mollusks and other invertebrates, and are known for timing migratory stopovers to coincide with seasonal food abundance at key staging sites. They gather in large, tightly coordinated flocks that wheel in unison over the water.

Nests are shallow tundra scrapes. The flight call is a low, muffled "knut" note, thought to be the origin of the species' name. Because of their reliance on a handful of critical stopover sites, knot feathers are often concentrated at these locations during migration windows.