Letters

01 July 1997
Comments Letters The paper on the spring migration of White-billed Divers Gavia adamsii past southwestern Norway (Brit. Birds 88: 125-129) prompts a closer examination of the possible significance of spring records in British waters, particularly as it was suggested th...
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Letters

01 December 1966
Comments Letters Week-end bias, length of stay of rarities and proportion of rarities undetected Sirs,--Although the effect of 'week-end bias' (the increased watching at week-ends) is often commented on, there appear to be no figures to show exactly how marked it is. In a...
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