Letters

01 November 1993 Comments Letters Red-crested Pochard hybrids. The occurrence of hybrids involving Red-crested Pochards Netta rufina may not be so unusual as is suggested by A. H. J. Harrop's note (Brit. Birds 86: 130). A. P. Gray (1958) recorded hybrids with 11 species of the genus An...
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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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