The Red Knot is a medium-sized shorebird with a small head, straight black bill (tapering from thick base to thinner tip) and long tapered wings, giving an elongated streamlined profile to the body. Red Knots in breeding plumage have a red face, breast and belly. The rufa Red Knot breeding plumage is paler and more "washed out" than the islandica subspecies.
Weight: 135 g (5 oz). Length: 23 to 25 cm (9 to 10 in).