Letters

01 September 1989 Comments Letters The identification of large terns. The paper on the 'Identification of large terns' (Brit. Birds 80: 257-276) gave the impression (fig. 2) that Royal Tern Sterna maxima has an almost blood-red bill, not especially dissimilar from that of Caspian S. cas...
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Letters

01 June 1969 Comments Letters Bill-length as a field-character of the White-winged Black Tern ? In his paper on 'Juvenile and winter plumages of the marsh terns' (Brit. Birds, 53: 243-252) Kenneth Williamson differentiated without qualification between the bill of the Black Tern Chlid...
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