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Knot Calidris canutus L 25cm. Dumpy, robust wader. Forms large flocks in winter. Has white wingbar but otherwise lacks distinctive features in non-breeding plumage. Sexes are similar. Adult in winter has uniform grey upperparts and white underparts. Bill is dark and legs are dull yellowish green. In summer plumage (sometimes seen in late spring or early autumn) has orange-red face, neck and underparts; back is marked with black, red and grey. Legs and bill are dark. Juvenile resembles winter adult but has scaly-looking back and peachy flush to breast. Voice Utters a sharp kwet call. Status Non-breeding visitor to Britain and Ireland. Locally common in winter on estuaries and mudflats.