Overview

Red Knot: Medium-sized sandpiper with black, brown and gray scaled upperparts, red-brown face, neck, breast and sides, and white lower belly. Wings show white bars in flight. Bill is black and slightly curved. Eats insects, larvae, mollusks and crabs. Swift direct flight with rapid wing beats.

Red Knot: Breeds on islands in the arctic regions of Canada. Spends winters along Pacific and Atlantic coasts from California and Massachusetts south to South America; also found in Europe and Asia. Nests on tundra; found on tidal flats, rocky shores, and beaches during migration and winter.

Voice Text

"quer-wer", "knut"

• The Red Knot was first described by Linnaeus in his Systema naturae in 1758 as Tringa canutus.
• It is estimated that during migration, as much as 90% of the total population of this bird can be found in Delaware Bay, feeing on the eggs of spawning horseshoe crabs.
• It does not regurgitate undigested hard parts of prey, as do many species of birds. Instead it excretes the hard parts in the feces.
• A group of knots are collectively known as a "cluster", "fling", and "tangle" of knots.

• Sanderling
• Willet
• Dunlin
• Stilt Sandpiper
• Rock Sandpiper
• Curlew Sandpiper
• Ruddy Turnstone
• Surfbird
• Great Knot

Sandpipers (Scolopacidae)

ORDER

The gulls, plovers, sheathbills of the Antarctic, predatory skuas, and sandpipers are five of the nineteen families in the taxonomic order CHARADRIIFORMES (pronounced kah-RAH-dree-ih-FOR-meez).

FAMILY TAXONOMY

The sandpipers are in the Scolopacidae (pronounced skoh-loh-PAY-suh-dee) family, a group of ninety-one species of wading birds in twenty-one genera occurring nearly worldwide.

NORTH AMERICA

In North America, sixty-five species of sandpipers in eighteen genera have occurred. Included among these birds are the large, long-billed godwits and curlews, the harlequin-like Ruddy Turnstone, and a variety of sandpiper species.

KNOWN FOR

Sandpipers are known for their affinity for the water’s edge. The Sanderling is known for its habit of running on beaches to pursue and retreat from waves in its attempt to remain at the very edge of the water.

PHYSICAL

Sandpipers range from the sparrow-sized “peeps” to the heron-sized curlews. In general, they have plump bodies, short tails, longish necks with small heads, and long, pointed wings for fast, long distance flight. Leg length varies among species although most have fairly long legs suited for wading. Sandpipers also demonstrate a wide variety of bill sizes and shapes that reflect different feeding behaviors; there are species with short, stubby bills, thin medium length bills, long, thin bills, and decurved bills.

COLORATION

Aside from the Ruddy Turnstone with its striking black, white, and orange plumage with red legs and bill, most sandpipers are plumaged in browns, gray, white, and black although dark red-orange colors are also shown by the breeding plumages of dowitchers and the Red Knot. In most species, these colors are combined for handsome, intricate patterns that act as camouflage and attract mates in the breeding season. During the winter, most species molt into drab gray and white plumages.

GEOGRAPHIC HABITAT

Sandpipers occur in a wide variety of aquatic habitats that include mudflats, beaches, shores of ponds, lakes and rivers, and marshes although two members of the family, the Long-billed Curlew and Upland Sandpiper, are grassland birds. Most members of this family breed in the extensive wetlands of the Arctic tundra, utilizing other wetland habitats during migration and winter.

MIGRATION

Most members of this family are migrants, several species flying to South America for the winter.

HABITS

The majority of sandpipers occur in flocks outside of the breeding season. They can often be seen foraging in mixed flocks for a variety of invertebrates and crustaceans, each species searching for food in a different manner or in different habitats. For example the Least Sandpiper probes just below the mud at water’s edge, dowitchers probe deep into the mud further out in the water, and the Greater Yellowlegs chases small fry with its bill held below the surface of the water.

CONSERVATION

Although not considered endangered, populations of the Red Knot in eastern North America have been steeply falling because of overharvesting of the Horseshoe Crab; the eggs of which serve as their main food source during a critical migration stop-over in the Delaware Bay.

INTERESTING FACTS

The Eskimo Curlew plays a role similar to that of the enigmatic and controversial Ivory-billed Woodpecker. A historically common bird, by the start of the twentieth century, it became very rare due to overhunting. Since then, unlike other shorebird species that were also heavily hunted, it has not recovered and might be extinct. A sliver of hope is kept alive, though, by documented sightings in the 1960’s, undocumented sightings since then, and the fact that it breeds and winters in very remote areas.

Author

Gary Owen Dick

Artist

Imran Kahn