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 from Continental Europe. Dr Bibby also suggested that the number of Bitterns correlates well with hard-weather movements. Whereas this may be true, there is

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