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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01 August 1961
Comments Notes Preening in flight.--So often one does not know what is unusual until someone else says it is. I refer to the publication of a note on a Little Gull (Larus minutus) preening in flight (Brit. Birds, 54: 117}Some attitudes adopted by {left to right) Black-h...
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