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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Letters

01 October 1928 Comments Letters SIRS,---I read with much interest two notes on the stripping of lime twigs b y Rooks (antea, p . 36). I t would n o t be wise t o conclude t h a t every twig found in this condition had been barked b y Rooks. I have watched a squirrel stripping twigs in a...
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