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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Letters

01 January 1950 Comments Letters SIRS,--I have delayed answering the letter on the above subject from Mr. P. H. T. Hartley (British Birds, xli, pp. 254-255) because the data then available only served to justify his remark that " more investigation is needed." I examined the two sets of ...
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