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 June 1973 Comments Letters Wallcreeper on migration in the Netherlands Dr H. Lohrl's statement (Brit. Birds, 63 : 167) that the Wallcreeper Tichodroma muraria is non-migratory has been challenged by David Elias, H. G. Alexander, Guy Mountfort and K. D. Smith (Brit. Birds...
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