Monthly marathon

01 September 1989
Comments Other It is very hard for a competition compiler to assess whether a particular puzzle is easy or difficult. He or she may think that the solution is glaringly obvious (or impossibly difficult), but the entrants may not spot the essential clue, or may see so...
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Seventy-five years ago...

01 September 1989
Comments Other Personally, I should find it much easier to believe that the corn-drill was partly responsible, for its effect would be to limit the number of possible breeding-sites; only it does not appear from the information received that any considerable proporti...
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Monthly marathon

01 April 1989
Comments Other As readers will have discovered, the January Sponsored by issue arrived lateā€”the result of a serious machine breakdown at the commercial company which packs and mails the issues of British Birds for us each month. We have, therefore, extended the 'Mo...
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Seventy-five years ago...

01 April 1989
Comments Other 'IT has long been known that, in the Common Crossbill (Loxia curvirostra) the mandibles cross indifferently on either side in different individuals. Recently, however, for a special purpose, I desired to ascertain whether or not individuals having the ...
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