Forster's Tern fishing at Viera Wetlands (Sterna forsteri)
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This is a small tern, 33–36 cm long with a 64–70 cm wingspan. It is most similar to the Common Tern. It has pale grey upperparts and white underparts. Its legs are red and its bill is red, tipped with black. In winter, the forehead becomes white and a characteristic black eyemask remains. Juvenile Forster's Terns are similar to the winter adult. The call is a harsh noise like a Black-headed Gull.