Letters

01 December 1981
Comments Letters Wintering Bitterns in Britain The recent paper by Dr C. J. Bibby on wintering Bitterns Botaurus stellaris in Britain (Brit. Birds 74: 1-10) illustrated that the population is supplemented in winter by immigration to this country of Bitterns fro...
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Letters

01 April 1967
Comments Letters Eruptions of Great Tits and other species Sirs,--I was interested in Dr. C. M. Perrins's paper on the effect of the seed crop of the beech Fagus sylvatka on the populations and movements of the Great Tit Partis major (Brit, Birds, 59: 419-432). To strengt...
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