Letters

01 November 1990 Comments Letters Sexual dimorphism of Marsh Tit. Both Gosler & King (1989) and Nilsson & Smith (1988) have recently reported sexual dimorphism in the intensity of the black of the cap on Marsh Tits Parus palustris (adults and first-years), males having markedly...
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Letters

01 January 1985 Comments Letters How many bird species in the world? In a recent book review (Brit. Birds 77: 280) mention is made of the '8,500-odd species' of birds in the world. A similar figure is quoted by the late Leslie Brown in his foreword to A Complete Checklist of the ...
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