Letters

01 March 1979
Comments Letters Field identification of Snowy Egret. When discussing the problem of distinguishing the Snowy Egret Egretta thula from the Little Egret E. garzetta in the field, Stanley Cramp (Brit. Birds 70: 206-214) and I. J . Ferguson-Lees (in...
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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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