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Sandwich Tern Sterna sandvicensis L 41cm. Striking seabird with buoyant flight and distinctive call. Sexes are similar. Adult in summer has pale grey back and upperwings; dark, crested cap, and otherwise white plumage Legs are black and long, black bill is yellow-tipped. Looks very white in flight. Non-breeding plumage (seen from late summer onwards) is similar but forehead is white. Juvenile is similar to winter adult but back is barred and scaly. Voice Utters a harsh chee-urrick call. Status Locally common summer visitor and an early-returning migrant. Coastal, nesting on shingle beaches and islands.