Letters

01 August 1996
Comments Letters The recent British Ornithologists' Union conference on 'Feral and introduced birds' prompted Holmes & Stroud (1995) to suggest a possible set of standard terms for describing the status of naturalised birds. Indeed, these terms could equally apply ...
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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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