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Sanderling Calidris alba L 20cm. Small, robust wader. Seen in flocks running at speed along edges of breaking waves on sandy beaches. Has white wingbar and black legs and bill. Sexes are similar. Adult in winter has grey upperparts and white underparts. In summer (sometimes seen in late spring or early autumn) plumage is flushed with red on head and neck and has dark-centred feathers on back; underparts are white. Juvenile is similar to winter adult but many back feathers have dark centres. Voice Utters a sharp plit call. Status Locally common non-breeding visitor, mainly to sandy beaches; occasional on shingle or mudflats.