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 blacker and glossier crowns than females. Indeed, although Gosler & King state that female Marsh Tits still have a blacker crown than Willow Ti


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